Viega PEX Commercial

Transcription

Viega PEX Commercial
System Design Manual
The global leader
in plumbing, heating
and pipe joining systems
Welcome
Viega, heritage of quality, vision for the future
Viega’s heritage of superiority demands nothing
but the best for our customers. Engineered to be
efficient, Viega products perform at the highest
possible level of quality, providing confidence and
peace of mind. Viega is the only manufacturer
to offer press systems in multiple pipe joining
materials, including polymer. More than one
million Viega press fittings are installed every day
around the world and, with a Supply Chain that
can process orders in less than 24 hours, Viega is
positioned to provide customers the best, most
versatile support in the industry.
Manual content and use
It is the responsibility of the specifying engineer,
contractor and installer to ensure the PEX
system is properly designed and installed,
adhering to the most current installation
instructions, utilizing the appropriate
components intended for the application.
Important notice
This installation manual is intended for commercial
installations of traditional (branch and tee) plumbing
systems, combination plumbing systems using
termination manifolds and ManaBloc and MiniBloc
parallel / manifold plumbing systems.
NOTE: References to ViegaPEX tubing made
throughout this publication include the entire line of
Viega cross-linked polyethylene products.
NOTE: Zero Lead identifies Viega® products
meeting the lead free requirements of NSF 61-G
through testing under the NSF/ANSI 372 (0.25% or
less maximum weighted average lead content).
In the event of conflict or inconsistency between
these installation guidelines and local building
or plumbing codes, local codes should take
precedence.
NOTE: Failure to follow the installation instructions
will void the Viega PEX Warranty. Nothing in this
publication is intended to create any warranty
beyond Viega’s applicable warranty. For additional
information, contact Viega at 800-976-9819.
2
IM-PF 573225 0415 (Commercial)
Contents
1 Introduction
1.1 Viega PEX Solutions. . . . . . . . . . . . . . . . . . . . . . . . . 4
2 ViegaPEX Ultra Tubing
2.1 What is PEX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Properties and performance . . . . . . . . . . . . . . . . . .
2.2.1 ViegaPEX Ultra properties and performance. . .
2.2.2 Tubing markings. . . . . . . . . . . . . . . . . . . . . . .
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6
6
6
3 FostaPEX Tubing
3.1 FostaPEX properties and performance. . . . . . . . . . 7
3.2 Tubing markings. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4 Codes, Standards and Certifications
4.1 Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Standards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Specifying Viega PEX Systems . . . . . . . . . . . . . . . .
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5 Viega Manifolds
5.1Viega manifold markings. . . . . . . . . . . . . . . . . . . . 10
6 Viega PEX Press Fittings
6.1 Viega PEX Press Polymer. . . . . . . . . . . . . . . . . . .
6.1.1 Viega Smart Connect feature . . . . . . . . . . . .
6.2 Viega PEX Press Bronze . . . . . . . . . . . . . . . . . . . .
6.3 Viega PEX Press fitting markings. . . . . . . . . . . . . .
6.4 PEX Press Tools. . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4.1 PEX Press power tools. . . . . . . . . . . . . . . . .
6.4.2 PEX Press hand tools. . . . . . . . . . . . . . . . . .
6.5 Making a Viega PEX Press connection with hand
tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5.1 Trimming and inserting the tubing. . . . . . . . .
6.5.2 Pressing with a hand tool. . . . . . . . . . . . . . .
6.5.3 Pressing with a power tool. . . . . . . . . . . . . .
7 PEX System Sizing
7.1 Code references. . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1.1 U.S. code approvals. . . . . . . . . . . . . . . . . . .
7.1.2 Canadian code approvals. . . . . . . . . . . . . . .
7.2 Sizing a PEX system . . . . . . . . . . . . . . . . . . . . . . .
7.2.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2.2 Sizing methods. . . . . . . . . . . . . . . . . . . . . . .
7.3 Viega PEX tubing. . . . . . . . . . . . . . . . . . . . . . . . . .
7.3.1 Flow velocity table. . . . . . . . . . . . . . . . . . . .
7.3.2 Pressure loss table . . . . . . . . . . . . . . . . . . . .
7.3.3 Velocity limits . . . . . . . . . . . . . . . . . . . . . . . .
7.4 Viega ManaBloc/MiniBloc . . . . . . . . . . . . . . . . . . .
7.4.1 Pressure loss. . . . . . . . . . . . . . . . . . . . . . . . .
7.5 Viega PEX Press fittings. . . . . . . . . . . . . . . . . . . . .
7.5.1 Equivalent feet of PEX tubing factor. . . . . . .
7.5.2 Viega PEX Press friction loss — equivalent
feet of SDR9 PEX tubing . . . . . . . . . . . . . . .
7.5.2.1 Calculating pressure drop through
fittings. . . . . . . . . . . . . . . . . . . . . . . .
7.5.2.2 Reducing fittings. . . . . . . . . . . . . . . .
8 System Design
8.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.1 Manifold installations . . . . . . . . . . . . . . . . . .
8.1.1.1 Homerun. . . . . . . . . . . . . . . . . . . . . .
8.1.1.2 Zone / combination. . . . . . . . . . . . . .
8.1.2 Grounding / bonding. . . . . . . . . . . . . . . . . . .
8.1.3 Hybrid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.1.4 Connecting PEX to metal tubing. . . . . . . . . .
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8.2 Hot Water System Design . . . . . . . . . . . . . . . . . . .
8.2.1 Re-circulation systems. . . . . . . . . . . . . . . . .
8.2.2 Balancing / velocity. . . . . . . . . . . . . . . . . . . .
8.2.3 Insulation. . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3 Fixture connections. . . . . . . . . . . . . . . . . . . . . . . .
8.3.1 Carrier systems. . . . . . . . . . . . . . . . . . . . . . .
8.4 Water quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.4.1 Piping details. . . . . . . . . . . . . . . . . . . . . . . . .
8.4.2 Fittings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5 Thermal expansion compensation. . . . . . . . . . . . .
8.5.1 Calculating expansion loops and offsets . . .
8.6 Structural considerations. . . . . . . . . . . . . . . . . . . .
9 Installation
9.1 General handling . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1.1 Handling ViegaPEX tubing . . . . . . . . . . . . . .
9.1.2 Bending ViegaPEX tubing. . . . . . . . . . . . . . .
9.1.3 Support ViegaPEX tubing. . . . . . . . . . . . . . .
9.1.4 PEX hangers. . . . . . . . . . . . . . . . . . . . . . . . .
9.1.4.1 Trapeze hangers. . . . . . . . . . . . . . . .
9.1.4.2 Clevis / tear drop hangers. . . . . . . . .
9.1.4.3 PEX support trays. . . . . . . . . . . . . . .
9.1.4.4 Pipe labels. . . . . . . . . . . . . . . . . . . . .
9.1.5 Noise and water hammer in PEX systems. . .
9.1.6 Chemical compatibility. . . . . . . . . . . . . . . . .
9.1.6.1 Spray foams. . . . . . . . . . . . . . . . . . .
9.1.6.2 Termiticides / pesticides. . . . . . . . . .
9.1.7 Freeze protection . . . . . . . . . . . . . . . . . . . . .
9.1.7.1 Insulation. . . . . . . . . . . . . . . . . . . . . .
9.1.7.2 Heat tape . . . . . . . . . . . . . . . . . . . . .
9.1.8 Freeze repair. . . . . . . . . . . . . . . . . . . . . . . . .
9.1.9 Condensation control. . . . . . . . . . . . . . . . . .
9.2 Building water service installation. . . . . . . . . . . . .
9.2.1 Installing PEX below grade as service line. . .
9.2.1.1 Trace wire. . . . . . . . . . . . . . . . . . . . .
9.2.2 Installing PEX under the slab . . . . . . . . . . . .
9.2.3 Installing PEX under a roadway . . . . . . . . . .
9.3 PEX installed in slab. . . . . . . . . . . . . . . . . . . . . . . .
9.3.1 Sleeving requirements. . . . . . . . . . . . . . . . . .
9.3.2 Sealants . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4 PEX risers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4.1 Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4.1.1 Clamps. . . . . . . . . . . . . . . . . . . . . . .
9.5 Fire resistant construction. . . . . . . . . . . . . . . . . . .
9.5.1 U.S. listings. . . . . . . . . . . . . . . . . . . . . . . . . .
9.5.1.1 Plenum rating. . . . . . . . . . . . . . . . . .
9.5.1.2 Fire resistant construction. . . . . . . .
9.5.2 Canadian listings. . . . . . . . . . . . . . . . . . . . . .
9.5.2.1 Plenum rating. . . . . . . . . . . . . . . . . .
9.5.2.2 Fire resistant construction. . . . . . . .
9.5.3 Firestopping systems . . . . . . . . . . . . . . . . . .
9.5.3.1 Caulking . . . . . . . . . . . . . . . . . . . . . .
9.5.3.2 Support collar systems. . . . . . . . . . .
9.6 System Testing and Flushing. . . . . . . . . . . . . . . . .
9.6.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6.2 Air testing . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.6.3 Leak detection. . . . . . . . . . . . . . . . . . . . . . . .
9.6.4 Disinfection. . . . . . . . . . . . . . . . . . . . . . . . . .
9.6.4.1 California flushing requirements. . . .
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10 Installer Checklist
10.1 Installers checklist for Viega PEX systems . . . . . 49
11 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3
1 Introduction
1.1 Viega PEX Solutions
Do more with Viega
Viega PEX Commercial Systems provide the most
complete potable water solution available. With
tubing, fittings and distribution manifolds, Viega
provides everything you need for a total plumbing
system that is not only easy to install but also helps
reduce energy cost and water waste. Viega provides
the highest-quality PEX tubing with the highestrated UV and chlorine ratings in the industry. Viega
PEX Press fittings allow installers to make secure
connections in less than seven seconds. With
Viega press technology, pressure testing can be
completed immediately after connections are made
without waiting for glues or solvents to dry or for
expansion rings to contract. Viega PEX Press fittings
are approved for potable water and hydronic heating
applications and are available in sizes ranging from
⅜" to 2" in both Zero Lead bronze and high-grade
polymer materials. With a 10-year transferable
warranty and unmatched quality in the industry,
Viega offers a complete system solution for all your
plumbing needs.
Viega was the first PEX manufacturer to introduce
press technology in the North American market
with its Bronze PEX Press fitting system. Viega
press technology is consistent and reliable,
providing the same quality pipe connections every
time. Viega PEX Press polymer fittings incorporate
the Viega Smart Connect feature, which helps
installers identify unpressed connections easily.
Viega PEX Press polymer fittings are manufactured
in the United States and provide secure, reliable
connections for residential, light commercial and
commercial projects, ranging from potable water to
snow melting applications.
4
A true innovator since 1899, Viega is at the forefront
of pipe joining technology with personalized
support, efficient delivery processes and
trustworthy quality. No other manufacturer can
provide the same level of service. The global leader
in plumbing, heating and pipe joining systems,
Viega is the name you can trust.
2 ViegaPEX Ultra Tubing
Viega PEX cross-linked polyethylene tubing is the
ideal tubing choice for potable water systems.
The smooth wall of Viega PEX tubing is resistant
to corrosion and scaling. Viega is the only PEX
manufacturer that is vertically integrated, meaning
we manufacture our own raw PEX resin controlling
the entire manufacturing process from start to finish
to ensure the highest quality.
The ASTM F876 manufacturing standard incorporates
a material designation number that is a rating scale
for chlorine resistance, UV resistance and material
strength. This designation consists of the tubing
material type “PEX” followed by a 4-digit number.
These 4 digits break down as follows:
What does the material designation code mean?
2.1 What is PEX
PEX is a material made up of molecules of high
density (HDPE) that are permanently linked to each
other by a process called crosslinking. This process
allows PEX to withstand higher temperatures and
pressures compared to standard HDPE tubing,
making it ideal for hot and cold potable water
applications as well as hydronic radiant heating and
cooling systems. There are three common methods
of crosslinking polyethylene, two of which are a
chemical method and one that is physical.
• Peroxide - Pressure/heat/chemical
• Silane - Moisture cure
• Radiation - Electron beam
Each method induces links between single strands
of PE to form a more dense network. The number
of links between these strands determines the
crosslink density and is an important factor in
determining the physical properties of the material.
The minimum percent crosslinking for each method
is specified in the ASTM F876 standard. These
methods are also known as PEX-a, PEX-b and
PEX-c, respectively, but are not related to any type
of a quality rating system.
Chlorine resistance
UV resistance
HDS @ 73°F 630 psi
PEX tubing with a printed rating of 5306 indicates that
Ultra
it will be suitable for installation areas of constant hot
water circulation and has a maximum UV exposure of
6 months.
The UV protection rating is important because certain
construction practices and storage conditions subject
PEX tubing to sunlight exposure for an extended
period of time. UV testing confirms the longevity of the
PEX tubing under various lengths of UV exposure.
Property
0
1
2
3
4
5
Chlorine
Resistance
Not
tested
75% at
73° and
25% at
140°F
Reserved
50% at
73° and
50% at
140°F
Reserved
100%
at
140°F
Minimum UV
Resistance
Not
tested
1 mo.
3 mo.
6 mo.
HDS for
water at 73°F
6
630
Viega’s silane crosslinked PEX (PEX-b) has the
highest chlorine and UV resistance per this rating
(PEX 5306). Another benefit is it has higher burst
pressures than peroxide crosslinked PEX (PEX-a).
This is due to the 3-dimensional molecular
bonding that occurs during the crosslinking
process.
5
2.2 Properties and performance
2.2.2 Tubing markings
ViegaPEX Ultra cross-linked polyethylene is the ideal
tubing choice for potable water systems. In addition,
the smooth walls of ViegaPEX Ultra tubing are resistant
to corrosion and scaling.
2.2.1 ViegaPEX Ultra properties and performance
Linear Expansion Coefficient:
• 1.1 inch per 100 feet per 10°F
Temperature and Pressure Ratings:
• 100 psi at 180°F
• 160 psi at 73.4°F
UV Resistance:
• Maximum exposure 6 months
Chlorine Resistance:
• PEX 5306 - end use condition of 100% at 140°F
(approved for continuous domestic hot water
circulation systems)
Do not use PEX for circulation lines
exceeding 140°F.
ViegaPEX tubing is marked every five feet with the
following representative information. See Table 2.2.
Print Line Markings
Length Marker
000 feet
Company
Viega
Product Name
ViegaPEX™ Ultra
Nominal Tubing Size
½"
Standard Dimension
Ratio Tube Size
SDR 9 CTS
(copper tube size)
Material Designation Code
PEX 5306
Temperature & Pressure Rating
100 psi @ 180F
160 psi @ 73F
NSF Listing (Potable)
cNSF®us-pw
ASTM
Tubing Standards Certification
F876/F877
Canadian Standard Assoc
Fittings System Compatibility
IAPMO listing
UPC®
UL Listing Rating*
cULus 3SAV UL1821
130 psi @ 120F
Plenum Rating**
FS/SD 25/50
ASTM E84
CAN/ULC S102.2
Fire Resistance Ratings
CAN/ULC S101
ANSI/UL 263
ICC Listing
AWWA Listing
HUD Listing
Manufacturer’s Date Code
Material Code
Country of Manufacture
ES-PMG™ - 1038
C904
MR 1276
1/1/2010
X14.2
Made in the USA
Bend Radius:
• ViegaPEX Ultra can be easily bent by hand, or with
the use of Viega-approved bend supports to a radius
as small as five times tubing outside diameter.
SDR-9 PEX Tubing
ASTM F876/F877/CTS-OD SDR-9
Tubing
Size
O.D.
Wall
Thickness
Nom.
I.D.
Weight
Per Ft
Vol. (gal.)
Per 100 Ft
⅜"0.500±.003 0.070+.0100.350 .0413 0.50
½" 0.625±.004 0.070+.010 0.475 .0535
0.92
¾" 0.875±.004 0.097+.010 0.671 .1023
1.82
1" 1.125±.005 0.125+.013 0.862 .1689
3.04
1¼" 1.375±.005 0.153+.015 1.054 .2523
4.52
1½" 1.625±.006 0.181+.019 1.244 .3536
6.30
2" 2.125±.006 0.236+.024 1.629 .6026 10.83
NOTE: Dimensions are in English units. Tolerances shown are ASTM
requirements. ViegaPEX Ultra is manufactured within these specifications.
Table 2.1 SDR-9 PEX Tubing
CSA B137.5
PureFlow - ASTM F877/
F1807/F2159
* ¾" through 2" Black ViegaPEX Ultra in residential NFPA 13D systems only
** 2" and smaller tube sizes when wrapped with ½" - 1" thick E84 rated
insulation, ½" and smaller with no insulation per ULC S102.2 listing.
Tubing may include fitting connections when wrapped.
Table 2.2 ViegaPEX Ultra Tubing Markings
Minimum Burst Pressure (PSI) Per ASTM F876/F877
SIZE 73°F (23°C)
180°F (82°C)
⅜"620 275
½"480 215
¾"475 210
1"
475
210
1¼"475 210
1½"
475
210
2"
475
210
Table 2.3
6
3 FostaPEX Tubing
FostaPEX tubing is the perfect companion for the Viega
PEX plumbing system. This tubing can be easily bent
by hand like the ViegaPEX tubing but holds its shape
after bending (combining the benefits of both rigid and
flexible tubing). The result is fewer fittings and bend
supports and less labor. A unique feature of FostaPEX
is that the inner layer is fully dimensioned Black
ViegaPEX Ultra tubing. The aluminum and outer PE
layers surround the inner PEX tubing. This construction
allows the inner layer alone to meet all temperature and
pressure requirements of the system. Using the prep
tool to remove the outer layers allows the use of the
standard Viega PEX Press bronze and polymer fitting
systems, which reduces tooling costs for the contractor
and simplifies connections.
3.1 FostaPEX properties and performance
Linear Expansion Coefficient:
• 0.16 inch per 100 feet per 10°F
Temperature and Pressure Ratings:
• 80 psi at 200°F*
• 100 psi at 180°F
• 160 psi at 73.4°F
*For non-potable hydronic heating systems only
UV Resistance:
• Maximum exposure 6 months based on FostaPEX’s
fully dimensioned black PEX core. Extended
exposure due to the outer aluminum layer (do not
install where permanently exposed to sunlight)
Chlorine Resistance:
• PEX 5306 — end use condition of 100% at 140°F
(approved for continuous domestic hot water
circulation systems)
3.2 Tubing markings
FostaPEX tubing is marked every five feet with the
following representative information. See Table 3.2.
Print Line Markings
Length Marker
000 feet
Company
Viega
Product Name
FostaPEX®
Nominal Tubing Size
½"
Standard Dimension
Ratio Tube Size
SDR 9 CTS
(copper tube size)
Material Designation Code
PEX 5306
psi @ 180F
Temperature & Pressure Rating 100
160 psi @ 73F
NSF Listing (Potable/Heating)
cNSF®us-pw-rfh
ASTM
Tubing Standards Certification
F876/F877
Canadian Standard Assoc
CSA B137.5
Fittings System Compatibility
PureFlow
ASTM F877
IAPMO Listing
UPC®
FS/SD 25/50
Plenum Rating*
ASTM E84
CAN /ULC S102.2
CAN/ULC S101
Fire Resistance Ratings
ANSI/UL 263
ICC Listing
ES-PMG™ - 1015,1038
AWWA Listing
C904
HUD Listing
MR 1276
Manufacturer’s Date Code
1/1/2010
Material Code
X18.1
Country of Manufacture
Made in the USA
* 1" and smaller tube sizes when wrapped in ½" - 1" thick E84
rated insulation, ½" and smaller with no insulation per ULC
S102.2 listing. Tubing may include fitting connections when
wrapped.
Table 3.2 FostaPEX Tubing Markings
exceeding 140°F.
Bend Radius:
• FostaPEX tubing can be bent to a radius of 3.5 times
tubing outer diameter with the use of a Viega tubing
bender.
Only for use with Viega PEX Press fittings.
Minimum Burst Pressure (PSI)
Per ASTM F876/F877
SIZE 73°F (23°C)
180°F (82°C)
½"480
⅝"475
¾"475
1"
475
215
200
210
210
SDR-9 PEX Tubing
ASTM F876/F877/CTS-OD SDR-9
Tubing
Size
Wall
O.D.
Nom. WeightVolume(Gal.)
Thickness
I.D.
Per Ft
Per 100 Ft
½" 0.625±.0040.070+.0100.475 .0600
⅝" 0.750±.0040.083+.0100.574 .0900
¾" 0.875±.0040.097+.0100.671 .1200
0.92
1.34
1.82
1"
3.04
1.125±.005 0.125+.013 0.863 .2000
NOTE: Dimensions are in English units. Tolerances shown
are ASTM requirements. Viega FostaPEX is manufactured
within these specifications. (These dimensions do not reflect
the outer aluminum and PE layers.)
Table 3.3 SDR-9 PEX Tubing
Table 3.1
7
4 Codes, Standards and Certifications
4.1 Codes
NSF International
The Viega PEX system is accepted by the following
model codes for use in potable hot and cold water
distribution systems.
ANSI/NSF 14: Plastics Piping System Components
and Related Materials — This standard establishes
minimum physical and performance requirements for
plastic piping components and related materials. These
criteria were established for the protection of public
health and the environment.
ICC – International Code Council
IPC – International Plumbing Code
IMC – International Mechanical Code
IRC – International Residential Code
UPC – Uniform Plumbing Code
UMC – Uniform Mechanical Code
NSPC – National Standard Plumbing Code
HUD – Housing for Urban Development
NPCC – National Plumbing Code of Canada
NBCC – National Building Code of Canada
Check with your local Viega representative for code
compliance in your area.
4.2 Standards
ASTM — American Society for Testing and Materials
ASTM F876/F2023: Standard Specification for
Cross-linked Polyethylene (PEX) Tubing — This
standard contains finite dimensional requirements
for SDR9 PEX tubing in addition to burst, sustained
pressure, chlorine resistance and other relevant
performance tests at different water temperatures.
ASTM F877: Standard Specification for Crosslinked Polyethylene (PEX) Plastic Hot- and ColdWater Distribution Systems — This standard
contains performance requirements for SDR9 PEX
tubing and fitting systems. The standard contains
finite dimensional requirements for tubing, in addition
to burst, sustained pressure and other relevant
performance tests at different water temperatures.
ASTM E84 — Standard Test Method for Surface
Burning Characteristics of Building Materials
ANSI/NSF 61: Drinking Water System
Components — Health Effects — This standard
establishes minimum health effects requirements for the
chemical contaminants and impurities that are indirectly
imparted to drinking water from products, components
and materials used in drinking water systems. This
standard does not establish performance or taste and
odor requirements for drinking water system products,
components or materials.
American Water Works Association (AWWA)
AWWA C904 — Cross-linked Polyethylene (PEX)
Pressure Pipe, ½" through 2" for Water Service
ISO — International Standards Organization
ISO 9001 — This standard is intended to establish,
document and maintain a system for ensuring
production output quality. ISO 9001 certification is a
tangible expression of a firm’s commitment to quality
that is internationally understood and accepted. All
PureFlow PEX Press fittings are manufactured in
ISO 9001 certified facilities.
4.3 Certifications
PPI — Plastic Pipe Institute
TR 4 Listed Materials
Listing of Hydrostatic Design Bases (HDB), Strength
Design Bases (SDB), Pressure Design Bases (PDB)
and Minimum Required Strength (MRS) Ratings for
Thermoplastic Piping Materials or Pipe.
ASTM E119 — Standard Test Method for Fire
Testing of Building Construction and Materials
Pressure/Temperature Ratings:
•160 psi at 73.4°F
•100 psi at 180 °F
•80 psi at 200 °F
ASTM E814 — Standard Test Method for Fire Test
of Through-Penetration Firestop Systems
NSF International
8
NSF-pw certification mark — Product meets all
applicable performance standards for pressure-rated
potable water applications required in ANSI/NSF
Standard 14 and complies with ANSI/NSF Standard 61
for health effects.
cNSF®us pw-G — Product meets Zero Lead listing
meeting California AB 1953 and Vermont Act 193
CSA B137.5 — This standard specifies
requirements for thermoplastic pressure piping.
It includes reference publications, definitions,
abbreviations, general requirements for materials
and manufactured pipe and fittings, relevant test
methods, and marking requirements.
NSF U.P. Code — Product meets requirements of the
Uniform Plumbing Code™.
PEX 5306 — Tested and certified to the NSF-pw 5306
chlorine resistance rating for an end use condition of
100% @ 140°F per ASTM F876, which is the highest
chlorine resistance rating available through ASTM.
When the product is marked with the PEX 5306
designation it affirms the product is approved for use in
continuous domestic hot-water circulation systems with
up to 140°F water temperatures and has a maximum
UV rating of 6 months.
Underwriters Laboratories Inc. (UL)
UL1821 — Standard for Safety for Thermoplastic
Sprinkler Pipe and Fittings for Fire Protection Service
(NFPA 13D systems only)
ANSI/UL 263 — Standard for Safety for Fire Tests for
Building Construction and Materials
Underwriters Laboratories of Canada Inc. (cUL)
CAN/ULC — S101 — Standard Methods of Fire
Endurance Tests of Building Construction and Materials
IAPMO R&T — International Association of
Plumbing and Mechanical Officials Research
and Testing
Certificate of Listing — Product meets the
requirements of the Uniform Plumbing Code™
ICC — ES — International Code Council —
Evaluation Services
ICC ES-PMG™ — Product complies with International
Plumbing Code
Note: Certifications available at:
www.nsf.org
www.spec-direct.com (Intertek)
www.ul.com
www.canada.ul.com
4.4 Specifying Viega PEX Systems
Viega offers many tools to assist the specifying
engineer, engineer, contractor and installer to
ensure Viega PEX systems are properly designed
and installed. This can be done by referring to one
of the resources listed below:
• Engineering Specifications are available at
www.viega.us
• Viega guide specifications in Master Spec
format are available upon request at 1(800) 976-9819.
• Contact your local Viega field sales
representative.
CAN/ULC — S102.2 — Standard Method of Test
for Surface Burning Characteristics of Flooring, Floor
Covering and Miscellaneous Materials and Assemblies
CAN/ULC — S115 — Standard Method of Fire Tests of
Firestop Systems
CAN/ULC/ORD/-C199P — Combustible Piping for
Sprinkler Systems
Check with your local Viega representative for further information or copies of above-mentioned listings and certifications.
9
5 Viega Manifolds
Viega offers several different manifolds to meet a
variety of applications, whether it is a parallel water
distribution system or combination installation.
5.1 Viega manifold markings
Each Viega manifold is marked where space permits
with the following information:
Manufacturer
VIEGA
ASTM standard
Temperature Rating
ASTM F877 / F1807 / F2159
180°F
UPC®, cNSF®us pw-G,
CSA B137.5,
ICC-ES PMG™ 1038
Certifications
NOTE: All manifolds may not be listed with each
organization shown.
10
To maintain your warranty and be code
compliant, use only Viega-approved
fittings to connect ViegaPEX Ultra
tubing to the ManaBloc.
Viega polymer manifolds must be
protected from UV exposure, which can
damage them. In the event of incidental
UV exposure during storage, installation
and handling, combined exposure
of Viega polymer manifolds shall not
exceed 15 days.
Do not expose Viega products to any
foreign substance that includes but
is not limited to VOC (volatile organic
chemical) compounds, paints, solvents,
glues, cleaners and disinfectants. Viega
products that are exposed to these
types of substances are at risk of having
failures (leaks).
6 Viega PEX Press Fittings
Viega PEX Press fittings are available in Zero
Lead bronze and polymer and include a factoryassembled stainless steel sleeve with three viewing
holes and a color-coded tool locator ring to ensure
a proper press connection. The following design
criteria make Viega PEX Press fittings ideal for use
in commercial potable water applications.
• High corrosion resistance
• Excellent strength properties
• Resistant to stress corrosion
• Superior wear properties
All Viega PEX tubing, fittings and manifolds are NSF
certified for use in potable water systems.
6.1 Viega PEX Press Polymer
Viega PEX Press Polymer fittings are manufactured
from Radel® R and incorporate the Viega Smart
Connect feature.
6.1.1 Viega Smart Connect feature
Figure 6.1 Smart
Connect Feature
The Viega PEX Press
Polymer fitting system
incorporates the Viega
Smart Connect feature,
which is designed to
identify unpressed
connections by
intentionally leaking
under test pressures of
.5 psi to 100 psi. This
can be visually identified
by water leaking from
the unpressed fitting
joint. If testing with
compressed air, it is
necessary to use an
approved leak-detect
solution (see “9.7.3
Leak detection” on page
47), applied to each
connection, to identify
a suspected leak.
Press any connections
that may have been
missed and/or replace
connections found to be
in question. Repeat the
system pressure test.
6.2 Viega PEX Press Bronze
Viega PEX bronze fittings are manufactured from
a high-quality Zero Lead material specifically
designed for press technology meeting or
exceeding all manufacturing requirements.
Use only Teflon tape on all threaded connections
6.3 Viega PEX Press fitting markings
Each Viega PEX Press fitting is marked where space
permits with the following information:
Use only Viega stainless steel attached
PEX Press sleeves and press tools with
Viega PEX Press fittings.
Viega PEX Press polymer fittings must
be protected from UV exposure, which
can damage them. In the event of
incidental UV exposure during storage,
installation and handling, combined
exposure of PEX Press fittings shall not
exceed 15 days.
foreign substance that includes but
is not limited to VOC (volatile organic
chemical) compounds, paints, solvents,
glues, cleaners and disinfectants.
Viega products that are exposed to
these types of substances are at risk of
having failures (leaks).
11
6.4 PEX Press Tools
6.4.2 PEX Press hand tools
6.4.1 PEX Press power tools
The Viega PEX Press fitting connection may also
be installed with a Viega PEX Press hand tool.
The hand tool incorporates a forced compression
mechanism to complete a secure connection each
time. A ratchet inside the tool prevents the tool
from being opened until the proper force has been
applied to the press sleeve. A safety release screw
allows the tool to be opened at any time, but any
connection made without full tool compression
must be repressed. The tool handles are color
coded to match the PEX Press tool locator rings.
The Viega PEX Press fitting connection shall be
installed with use of a Viega PEX Press tool. The
Ridgid power tool is designed to make consistent
presses and has interchangeable jaws that can be
easily changed out as needed. The compression of
the tool also allows press connections to be made in
temperatures as low as 23°F.
The reduced grip feature permits one-handed
operation, making the Viega PEX Press system
perfect for tight spaces and awkward locations. The
compression of the tool also allows press connections
to be made in temperatures as low as -4°F.
Figure 6.2 Compact Power Tool
Figure 6.4 PEX Press Hand Tools
Figure 6.3 Standard Power Tool
12
6.5 Making a Viega PEX Press connection with hand tool
6.5.1 Trimming and inserting the tubing
1
2
4
3
1. Square off tubing to proper length. Uneven, jagged or irregular cuts will produce unsatisfactory connections.
2. If using FostaPEX tubing, insert into prep tool, push and turn until no resistance is felt. If using ViegaPEX,
continue to Step 3.
3. Insert PEX Press fitting with attached sleeve into tubing and engage fully.
4. Ensure full tubing insertion at view holes in attached press sleeve. Full insertion means tubing must be
completely visible in at least two view holes and partially visible in the one.
6.5.2 Pressing with a hand tool
6
5
7
8
PureFlow
1/2”
PureFlow
1/2”
PureFlow
1/2”
Turn screw for
emergency release.
5. Position press tool perpendicular over press sleeve, resting it against the tool locator ring.
Note: The tool locator ring must be in the factory-installed position while making a press to provide a consistent leakproof connection. It may be necessary to rotate the tool locator ring to avoid interference
between the ring and tool.
6. Close handles, using trigger to reduce grip span if desired.
7. Extend handle and continue ratcheting until automatic tool release occurs at proper compression force.
8.Warning: The connection is not leakproof when the tool has been opened by emergency release.
The tool locator ring must be present to ensure a proper PEX Press connection.
6.5.3 Pressing with a power tool
5
6
7
8
5. Insert the appropriate Viega PEX Press jaw into the press tool and push in the holding pin until it locks.
6. Open jaw and position perpendicular over press sleeve, resting it against the tool locator ring.
Note: The tool locator ring must be in the factory-installed position while making a press to provide a
consistent leakproof connection. It may be necessary to rotate the tool locator ring to avoid interference
between the ring and tool.
7. Start pressing process; hold the trigger until the jaw has automatically released.
8. When press connection is complete, open and remove jaw.
9. Warning: The tool locator ring must be present to ensure a proper PEX Press connection.
13
7 PEX System Sizing
7.1 Code references
7.1.1 U.S. code approvals
Viega PEX and its related plumbing components
are recognized by the International Plumbing Code
(IPC), Uniform Plumbing Code (UPC) and the
National Plumbing Code (NPC).
Viega has attained the below evaluation reports
attesting its compliance with their respective model
plumbing codes. Refer to these reports and their
respective codes when sizing PEX systems for
residential and light commercial buildings.
• ICC-ES PMG 1038
• IAPMO 4030
• IAPMO 3700
7.1.2 Canadian code approvals
Viega PEX and its related plumbing components are
recognized by the National Plumbing Code of Canada
(NPCC). Refer to the respective sizing tables and/
or any provencial code requirements for sizing Viega
PEX systems for residential and light commercial
buildings.
7.2 Sizing a PEX system
7.2.1 General
Viega PEX plumbing systems are sized using the same
methods as other traditional piping materials outlined
in each respective model plumbing code. While all
PEX tubing has a slightly smaller I.D. than equivalent
metal piping systems, its flexibility (requiring fewer
fittings) and smooth inner walls make up for this slight
dimensional difference. For pipe sizing methods that
require the friction loss and velocity characteristics of
PEX tubing, this information is available in Section “7.3
Viega PEX tubing” on page 15.
7.2.2 Sizing methods
There are several methods for determining potable
water distribution pipe sizing within each model
plumbing code. While each method may differ they
all rely on similar basic information to be attained
in order to accurately size a system. Below are the
most common factors required for sizing a system.
• Available water supply pressure
||This includes pressure losses through inline
devices like meters & water softeners
• Total fixture demand for all fixtures being
supplied within the building expressed as:
||W.S.F.U. (water supply fixture units) or
||GPM (gallon per minute)
• Vertical elevation changes from water supply
to highest fixture
||Account for pressure loss or gain of 0.433
psi per foot of elevation change due to
gravity
• Total pipe length from water supply to most
remote highest-demand fixture
||Total tube length includes equivalent
length of fittings and/or valves inline
(depends on sizing method)
Once this information is compiled it can be applied
to the sizing method being used. The minimum
meter size is also determined within these methods.
In some cases you must account for all fittings and/
or valves as part of calculating the total pipe length
(also known as the developed tube length). The
fitting pressure loss is traditionally expressed as an
equivalent length of PEX tubing and is added to the
total pipe length to determine the developed tube
length. The fitting equivalent lengths of PEX tubing
are available from the fitting manufacturer; see
Section “7.5 Viega PEX Press fittings” on page 17.
Note: Always refer to the relevant code sizing
tables being used to size your system.
14
7.3 Viega PEX tubing
7.3.1 Flow velocity table
Flow Velocity ft/Sec
Flow Rate
GPM
⅜
½
¾
1
1¼
1½
0.5
1.7
0.9
0.75
2.5
1.4
0.7
1.0
3.3
1.8
0.9
0.5
1.5
5.0
2.7
1.4
0.8
0.6
2.0
6.7
3.6
1.8
1.1
0.7
0.5
Velocity < 0.5 ft/Sec
2.5
8.3
4.5
2.3
1.4
0.9
0.7
3.0
10.0
5.4
2.7
1.6
1.1
0.8
6.3
3.2
1.9
1.3
0.9
3.5
2
0.5
4.0
7.2
3.6
2.2
1.5
1.1
0.6
4.5
8.1
4.1
2.5
1.7
1.2
0.7
5.0
9.1
4.5
2.7
1.8
1.3
0.8
6.0
10.9
5.4
3.3
2.2
1.6
0.9
6.4
3.8
2.6
1.8
1.1
7.0
8.0
7.3
4.4
2.9
2.1
1.2
9.0
8.2
4.9
3.3
2.4
1.4
10.0
9.1
5.5
3.7
2.6
1.5
11.0
10.0
6.0
4.0
2.9
1.7
12.0
10.9
6.6
4.4
3.2
1.8
13.0
11.8
7.1
4.8
3.4
2.0
14.0
7.7
5.1
3.7
2.2
15.0
8.2
5.5
4.0
2.3
16.0
8.8
5.9
4.2
2.5
17.0
9.3
6.3
4.5
2.6
18.0
9.9
6.6
4.8
2.8
19.0
10.4
7.0
5.0
2.9
20.0
11.0
7.4
5.3
3.1
25.0
9.2
6.6
3.8
30.0
11.0
7.9
4.6
35.0
9.2
5.4
40.0
Velocity > 12 ft/Sec
10.6
6.2
45.0
11.9
6.9
50.0
7.7
55.0
8.5
60.0
9.2
65.0
10.0
70.0
10.8
75.0
11.5
Table 7.1
15
7.3.2 Pressure loss table
60°F (16°C) Water
Flow Rate
GPM
0.5
⅜
2.0
0.75
4.1
½
Pressure Loss PSI/ 100 ft of Pipe
¾
1
1¼
1.0
7.0
1.6
1.5
14.9
3.4
2.0
25.4
5.8
1.1
1½
Pressure Loss <1 PSI
2.5
38.5
8.7
1.6
3.0
53.9
12.2
2.3
3.5
16.2
3.0
4.0
20.8
3.9
1.1
4.5
25.8
4.8
1.4
5.0
31.4
5.9
1.7
6.0
44.0
8.2
2.4
7.0
10.9
3.2
1.2
8.0
14.0
4.1
1.6
9.0
17.4
5.1
1.9
10.0
21.1
6.2
2.3
1.0
11.0
25.2
7.4
2.8
1.2
12.0
29.6
8.8
3.3
1.5
13.0
34.3
10.1
3.8
1.7
14.0
11.6
4.4
2.0
15.0
13.2
5.0
2.2
16.0
14.9
5.6
2.5
17.0
16.7
6.3
2.8
18.0
18.5
7.0
3.1
19.0
20.5
7.7
3.4
20.0
22.5
25.0
30.0
35.0
40.0
Pressure Loss
Excessive as
Flow velocity
is > 12 ft/Sec
2
8.5
3.8
1.0
12.8
5.7
1.5
18.0
8.0
2.2
10.7
2.9
13.7
3.7
17.0
4.6
45.0
50.0
5.6
55.0
6.6
60.0
7.8
65.0
9.0
70.0
10.4
75.0
11.8
NOTE: Pressure Loss based on Hazen-Williams Formula (C = 150)
Pressure Loss for Actual Length can be calculated by following formula:
Actual Length / 100 ft X Value from chart above
Table 7.2
16
7.3.3 Velocity limits
7.5 Viega PEX Press fittings
Viega recommends the following design velocities
for hot and cold PEX water distribution systems:
7.5.1 Equivalent feet of PEX tubing factor
Pressure loss through PEX insert fittings can
be expressed by referencing the Equation of
Continuity, which states inflow equals outflow.
• Domestic cold water — 10 fps
• Domestic hot water — 8 fps
The flow velocity through Viega’s PEX Press fittings
does not fall under these limitations. The equivalent
length of PEX tube for Viega PEX Press fittings
is available from Viega to assist in system sizing
where applicable (refer to Section “7.3.1 Flow
Velocity Table” on page 15).
7.4.1 Pressure loss
Pressure
Loss*
K - Factor
⅜" Port
2.5 GPM
2 PSI
0.35
½" Port
4.4 GPM
4.1 PSI
0.21
1¼" Manifold**
31 GPM
11.5 PSI
0.012
*Pressure Loss = K x gpm2
**36 port manifold
Out Flow
A1 x V1
A2 x V2
A1 x V1 = A2 x V2
ManaBloc / MiniBloc Pressure Loss
Rate Flow
In Flow
A1 x V1
Figure 7.1 Effects of fitting I.D.
7.4 Viega ManaBloc/MiniBloc
Size
F877 (Viega Press)
Where: A = cross sectional area
V = velocity of liquid
The water velocity increases as it passes through
the fitting, creating a slight pressure loss. This
pressure loss can be calculated by using the
equivalent feet of PEX tubing factor (see Table 7.4).
Table 7.3
7.5.2 Viega PEX Press friction loss — equivalent feet of SDR9 PEX tubing
PEX Press Bronze Fittings
Size
⅜"
½"
¾"
1"
1¼"
1½"
2"
Coupling
2.9
2.0
1.0
1.0
2.0
2.0
1.0
Elbow
9.2
9.4
8.0
10.0
11.0
13.0
19.0
Tee Run
2.9
2.2
1.0
2.0
2.0
2.0
2.0
Tee Branch
9.4
10.4
9.0
10.0
11.0
12.0
18.0
Tee Run
6.5
3.9
3.6
3.8
6.4
7.9
10.2
Tee Branch
14.7
14.0
19.1
18.4
18.7
28.3
37.5
PEX Press Polymer Fittings
Size
⅜"
½"
¾"
1"
1¼"
1½"
2"
Coupling
4.5
2.6
2.5
3.1
4.0
5.2
8.9
Elbow
14.3
12.6
18.9
17.7
18.6
29.4
36.4
Table 7.4
17
7.5.2.1 Calculating pressure drop through fittings
7.5.2.2 Reducing fittings
To account for pressure drop through a PEX fitting,
simply take the equivalent feet factor noted in Table
7.4 for the size and type of fitting and multiply it by
the PEX tubing pressure loss per foot factor (see
“Table 7.2” on page 16) for that same PEX tube
size per the flow rate being applied.
When a reducing fitting is used, a tee for example,
simply use the coinciding value for the branch leg
size. If the run legs are different sizes, use half (0.5)*
of each of their respective equivalent value for each
size. Once these values are determined, apply them
to their respective tubing pressure drop factors per
the flow rate being applied.
Example:
• ½" PEX Polymer Elbow has an equivalent
PEX tubing factor of 12.6 ft.
• ½" PEX tubing has a 20.8 psi drop per 100
feet at 4 gpm.
• 20.8/100 ft. = 0.208 psi per foot
• 12.6 x 0.208 = 2.6 psi drop
Example:
¾" x ½" x ¾" PEX Press polymer tee at 4 GPM
through the ½" connection would have the following
pressure drop:
Calculating ¾" run leg
• ¾" run leg of tee = 3.6 equiv ft of PEX
||3.6 x 0.5 = 1.8 equiv ft of PEX
• ¾" PEX at 4 GPM = 3.9 PSI / 100ft loss
||3.9 PSI / 100ft = 0.039 PSI / ft. loss
||0.039 PSI x 1.8 equiv ft= 0.07 PSI loss
Calculating ½" run leg
• ½" run leg of tee = 3.9 equiv ft of PEX
||3.9 x 0.5 = 1.95 equiv. ft of PEX
• ½" PEX at 4 GPM = 20.8 PSI / 100ft loss
||20.8 / 100ft = 0.208 PSI / ft. loss
||0.208 x 1.95 = 0.41 PSI loss
Combined run leg
• 0.07 PSI + 0.41 PSI = 0.48 PSI loss through
run leg of reducing tee
* Multiply by 0.5 to get half of the full run length
value for the reducing tee.
18
8 System Design
8.1 General
8.1.1.2 Zone / combination
While a branch and tee system design is still the most
common method used for potable water distribution
installations, Viega recommends using more efficient
system design methods when possible. These
methods consist of combination manifold and/or
home run systems that promote water and energy
savings as well as reducing the number of fittings in
the system. The following sections will provide an
overview of each system type to assist with selecting
a system that best fits your needs.
Zone or combination manifold plumbing systems
use multiple manifolds combined with a branch
and tee system. These systems use various sizes
of manifolds located throughout a structure placed
near each main fixture group supplied by the main
hot and cold supply lines, similar to a branch and
tee system. Multiple branch lines are connected to
a manifold in a common location in lieu of multiple
tees spread throughout the system. This takes
advantage of benefits from both types of systems
and helps keep hidden fittings to a minimum.
8.1.1 Manifold installations
8.1.1.1 Homerun
A homerun system, also known as parallel system,
is a unique method of plumbing that provides water
and energy savings and can reduce water waste
up to 40% compared to traditional distribution
plumbing systems. This system consists of a
centralized manifold with individual distribution
lines that run to each fixture (hot and cold). These
lines are sized to the specific fixture demand using
⅜" for low-demand fixtures (2.5 gpm or less) and
½" for higher-demand fixtures (up to 4 gpm).
Combination Installation
Low
Med High
Connections
Installation Time
System Efficiency
Figure 8.2 Combination Installation
8.1.2 Grounding / bonding
Home Run Installation
Low
Connections
Installation Time
Med High
Viega PEX tubing shall not be used as an electrical
ground. Consult with the NEC (National Electrical
Code) for recommended ground method when
plastic pipe is used.
Do not ground plastic piping!
System Efficiency
Figure 8.1 Home Run Installation
19
8.1.3 Hybrid
8.2 Hot Water System Design
Viega PEX tubing
installed in a potable
water distribution system
with metallic tubing is
considered a hybrid
system. Hybrid systems
can give the installer
and/or designer more
versatility in their designs
while staying price
competitive. An example
of this type of installation
method would be using a
copper riser as the main
supply with PEX tubing on
each level as distribution
tubing.
There are several types of hot water circulation
systems to choose from as well as considerations
for designing each of them. These can range from
building size and/or layout to the required water
delivery temperature for a specific application.
It is the responsibility of the designer / specifier
to select the appropriate system based on the
application while ensuring the system temperatures
and pressures don’t exceed the ratings for the
plastic tubing being used.
8.1.4 Connecting PEX to metal tubing
PEX can be connected directly to metal tubing
with the use of ProPress by PEX Press adapters,
threaded adapters, flare adapters, female union
adapters or the use of solder adapters. Viega is
the only manufacturer that offers a solution for
connecting PEX tubing directly to copper tubing
using press technology.
Viega’s PEX tubing is tested and listed to the
requirements of ASTM F876 with a material
designation code of PEX 5306. The first digit of
this code (5) is the PEX tubing chlorine resistance
ratings which means the PEX product is approved
for 100% end use condition at 140°F. This is the
highest chlorine rating available per the ASTM F876
standard. Products marked with the (5) designation
are approved for continuous domestic hot water
circulation systems not to exceed 140° F.
exceeding 140°F.
8.2.1 Re-circulation systems
There are three main types of hot water circulation
systems.
• Continuous
• Timer
• On demand
These systems have their own strengths and
weaknesses so it is important to understand their
differences in order to specify the right one. Below
is an overview of what these systems entail.
Figure 8.3 Model 2813PZL
PEX Press x ProPress
Figure 8.5 Model 2813.5ZL
PEX Press x Female
Copper Tube Size
20
Figure 8.4 Model 2811ZL
PEX Press x M NPT
Figure 8.6 Model 2892ZL
PEX Press x Flare
Continuous – The system operates 24 hours a
day, 7 days a week. This being said there is a
noticeable cost of operation. This system should
only be used where hot water is necessary all the
time throughout the system. These can have high
operating costs and premature component wear.
Timer – The system can be programmed to
activate during peak hours of usage, limiting how
often the pump runs throughout the day. Some
of these systems incorporate an aquastat to limit
pump use even more. This reduces the operating
cost and wear and tear on those components.
On demand – The system is activated manually
when hot water is needed. These systems are
probably the most efficient but require the end user
to be accustomed to operating them effectively.
There is a priming period once the system is
activated, causing a slight delay prior to hot water
being present.
Proper stub out supports for PEX tubing in this
application are crucial. Do not rely on nearby piping
to support the stub out piping. Use engineered
solutions designed for the application. Use
appropriate support techniques as identified by the
manufacturer of the carrier system.
8.2.2 Balancing / velocity
Industry agencies like American
Society of Plumbing Engineers
(ASPE) provide design criteria
for hot water systems that
include balancing and velocity
guidelines. Proper balancing
eliminates uneven water
temperatures and delivery
times caused by the water
naturally taking the path of least
resistance known to happen on
shorter loops. Also, as a general
design practice for hot water
circulation systems, you shall
not exceed velocities of 2 fps
including circulation lines. Viega
provides the necessary product
specifications to design efficient
hot water systems.
PEX header
PEX supply line
(size may vary)
Copper carrier
bracket with
copper stub
Urinal carrier
mounting bracket
with copper stub
Water closet
carrier mounting
bracket
Figure 8.7 PEX Piping to Flush Valves - Front View
8.2.3 Insulation
While plastic tubing has some
insulation properties (R-value)
it generally is not enough to
meet most thermal performance
requirements as outlined in hot
water plumbing or energy codes.
As a general practice, anywhere
metal piping requires insulation,
plastic piping will too. Always
check code for necessary
insulation requirements.
8.3 Fixture connections
8.3.1 Carrier systems
Hammer arrestor with isolation valve as
required by code (refer to arrestor
manufacturer for required location).
Drain/vent piping
Carrier systems that utilize flush
valves are commonly used in
commercial applications. The
detail to the right shows a typical
bank installation of multiple flush
valves and PEX supply piping.
Figure 8.8 PEX Piping to Flush Valves - Rear View
21
8.4 Water quality
8.4.1 Piping details
In recent years, the focus in the U.S. has split
between drinking water treatment and pollution
prevention prior to treatment. While both improve
drinking water, by focusing on the cleanliness of
the source water the EPA is able to ensure cleaner
water for the environment as well as people. Below
are some of the restrictions placed on both our raw
water and our finished water.
There are a few methods for piping hot water
supply lines to help eliminate dead legs and keep
water moving. Below are a few piping diagrams
showing series and loop methods.
Water quality, according to the U.S. EPA, is the
chemical, physical and biological characteristics
of water. The quality of both source and treated
water must adhere to the standards and mandates
of the Clean Water Act (CWA). The CWA includes
requirements related to effluent discharge limits,
guidelines, testing and pretreatment guidelines.
The primary purpose of the CWA is to minimize
the pollutants discharged to public waters. The
purpose of this limit is twofold. Limiting industrial
discharge to bodies of water protects the plants
and animals that live in and depend on that body of
water. Also, many surface waters are processed for
human consumption or other use; minimizing the
pollution that goes into the water makes it easier
and less expensive to further process the water.
Overall, the CWA is in place to maintain the health
of ecosystems and safety of all waters for human
use and consumption.
Stagnation in water distribution systems is a
problem in most modern buildings, but it is a larger
problem in hospitals where immunocompromised
patients can be found coexisting with piping dead
ends and inconsistent occupancies that lead to
periods of stagnation. Stagnation can lead to
a buildup of biofilms and pathogens that can
ultimately damage the system, causing health
problems for those exposed. Other areas where
stagnation and the consequences associated
with it may cause health concerns are hotels and
schools, where water use follows the inconsistent
use of the building.
Figure 8.9 Series Diagram
Figure 8.10 Loop Diagram
The following design methods have been proven in
Europe and will soon be available in North America
thanks to Viega’s line of flow-through fittings.
Stagnation can now be minimized to extents not
previously possible by designing and installing
plumbing in a completely new way. Just as the
Viega ManaBloc provided an innovative alternative
to branch and tee systems, Viega’s flow-through
fittings make “series” and “loop” installation a
possibility.
A series installation utilizes a strategy that
generates flow through the supply piping of all
fixtures connected in series prior to the one in
use. Figure 8.9 shows a series installation where
each circle represents a fixture connection. A loop
installation, like the one in Figure 8.10, incorporates
supply piping that allows flow in either direction.
This lets water be supplied to a single fixture
from both the left and right sides. The use of any
fixture in a loop will induce flow up to the point of
connection, significantly reducing or eliminating
dead legs.
For more detailed design information contact your
local Viega sales representative.
22
8.4.2 Fittings
Viega offers a special Zero Lead double elbow fitting
that simplifies piping these circuits. It allows you
to flow the supply water through the fitting and on
to the next fixture. The fixture supply connects to a
standard ½" F NPT to transition out from the wall.
For unconstrained tubing runs (not within the floor)
Viega recommends the use of expansion offsets.
This can be accomplished at a corner or by using
offsets or loops on straight tubing runs. Expansion
compensators should be installed at the midway
point of tubing runs and should be spaced no more
than 50 feet apart.
Using a loop to accommodate
tubing expansion
Offsets also provide room for
tubing expansion
Figure 8.11 Double Elbow
8.5 Thermal expansion compensation
ViegaPEX Ultra tubing, as with any PEX tubing,
expands and contracts with temperature changes
in the environment or the fluid inside the tubing.
The longer the tubing run and the higher the
temperature change, the more linear expansion
the system will experience. This expansion and
contraction can affect the appearance as well as
integrity of the system by putting stress on the
tubing, fittings, valves and fasteners. The system
should be designed to accommodate tubing
expansion.
Tubing fasteners perform two functions: providing
support for the tubing and guiding the tubing during
expansion and contraction. It is important to keep
this in mind when installing fasteners. An expansion
compensator will not be effective if the fasteners
prevent linear movement of the piping system.
Tubing sizes smaller than ¾" generally do not
require expansion compensators with fittings and
can easily be bent into loops and offsets to absorb
linear expansion. For tube sizes 1" and larger, refer
to “Calculating expansion loops and offsets” on
page 24 for compensation options.
⅛" to 3/16"
slack per foot
Allow some slack in all runs to prevent damage from
tubing contraction.
Figure 8.12 Tubing Expansion
Below is an example of required offsets for a
100-foot tubing run. Note that the expansion
compensators are no more than 50 feet apart.
50'
25'
50'
50'
25'
100'
Figure 8.13 Example of Required Offsets
23
8.5.1 Calculating expansion loops and offsets
There are three types of expansion offsets
recommended for use with large-diameter tubing:
the corner expansion offset, the Z-type expansion
offset and the U-type expansion loop. A description,
illustration and dimensions chart for each type of
offset is on the next few pages. See “FostaPEX” on
page 28 for FostaPEX recommendations.
Linear expansion:
o calculate linear expansion for PEX tubing, use
T
the following formula:
∆L =
PEX expansion rate
100' x 10°F
x ∆T x tubing length ft
Where:
ViegaPEX and ViegaPEX Ultra expansion rate =
1.1" per 100' per 10°F
∆T = Change in temperature (in °F)
For example:
40' of 1" ViegaPEX tubing going from 70°F to 130°F
∆L =
1.1"
x 60° x 40' = 2.64"
1000
∆L = 2.64"
24
Compensation distance:
o calculate the dimensions of the expansion compensation offset needed, use the following formula:
T
L = C√OD x ΔL
Where:
L = length of compensation distance
C = 12 (PEX material specific constant)
OD = outer tubing diameter (⅛" + nominal tube size)
ΔL = change in length from temperature change
Corner expansion offset:
Where piping takes a corner after a long straight run, a simple 90° elbow in the piping will allow for the
absorption of expansion. Calculate the necessary “L” dimension between elbow and nearest fastener or use the chart below,
which was figured using the maximum run for a single expansion compensator (50 feet).
Following the previous example:
L = C√OD x ΔL
Where:
C = 12
OD = 1.125 (1" PEX)
ΔL = 2.64"
L = 12√1.125" x 2.64" = 20.7"
L = 20.7"
Illustration of Example
L
L = 20.7"
Figure 8.14 Corner Expansion
Corner Expansion Offset (L, in)
per 50 linear feet of run
Tubing
ViegaPEX
&
ViegaPEX
Ultra
Tube
nom.
ΔT(°F)
60
80
100
120
140
160
180
200
¾"
20.4
23.6
26.4
28.9
31.2
33.4
35.4
37.3
1"
23.2
26.7
29.9
32.8
35.4
37.8
40.1
42.3
1¼"
25.6
29.6
33.1
36.2
39.1
41.8
44.4
46.8
1½"
27.8
32.1
35.9
39.4
42.5
45.5
48.2
50.8
2"
31.8
36.8
41.1
45.0
48.6
52.0
55.1
58.1
Table 8.1 Corner Expansion
25
Z-type expansion offset:
The Z-type expansion offset integrates two 90° elbows that form a “Z” pattern.
With this type of configuration ½ of the “L” dimension is applied to the center area of the “Z” (represented
as L1 in the table and illustration) while ¼ of the “L” dimension would be applied to each of the top and
bottom areas (represented as L2).
Calculate the necessary L1 and L2 dimensions or use the chart below, which was figured using the
maximum run for a single expansion compensator (50 feet).
L = 20.7"
L1 = ½ (L)
L2
L1 = 20.7"/2 = 10.35"
L1 = 10.35"
L2 = ¼ (L)
L2 = 20.7"/4 = 5.18"
L2 = 5.18"
L2 = 5.18"
L1
L1 = 10.35"
L2 = 5.18"
L2
Figure 8.15 Z-Type Expansion
Z- Type Expansion Offset (in)
Tubing
Tube
nom.
ΔT(°F)
¾"
ViegaPEX
&
ViegaPEX
Ultra
60
80
100
120
140
160
180
200
L1
L2
L1
L2
L1
L2
L1
L2
L1
L2
L1
L2
L1
L2
L1
L2
10.2
5.1
11.8
5.9
13.2
6.6
14.4
7.2
15.6
7.8
16.7
8.3
17.7
8.8
18.6
9.3
1"
11.6
5.8
13.4
6.7
15.0
7.5
16.4
8.2
17.7
8.8
18.9
9.5
20.1
10.0
21.1
10.6
1¼"
12.8
6.4
14.8
7.4
16.5
8.3
18.1
9.1
19.6
9.8
20.9
10.5
22.2
11.1
23.4
11.7
1½"
13.9
7.0
16.1
8.0
18.0
9.0
19.7
9.8
21.3
10.6
22.7
11.4
24.1
12.1
25.4
12.7
2"
15.9
8.0
18.4
9.2
20.5
10.3
22.5
11.3
24.3
12.2
26.0
13.0
27.6
13.8
29.1
14.5
Table 8.2 Z-Type Expansion
26
U-type expansion offset:
The U-type expansion loop integrates four 90° elbows that form a “U” pattern.
With this arrangement ⅕ of the “L” dimension is applied as the width (represented as L3) while ⅖ of “L” is
applied as each leg in the other dimension (represented as L4).
Calculate the necessary L3 and L4 dimensions or use the chart below, which was figured using the
maximum run for a single expansion compensator (50 feet).
L = 20.7"
L3 = ⅕ (L)
L3 = 20.7"/5 = 4.14"
4-6"
4-6"
L3 = 4.14"
L4 = ⅖ (L)
L4 = 2(20.7")/5 = 8.28"
L4 = 8.28"
L4
L4 = 8.28"
L4
L4 = 8.28"
L3
L3 = 4.14"
Figure 8.16 U-Type Expansion
The fastener shown on the L3 leg may be required to provide additional support depending on how the expansion loop is installed
(horizontal/vertical).
U-Type Expansion Offset (in)
Tubing
ViegaPEX
&
ViegaPEX
Ultra
Tube
nom.
ΔT(°F)
60
80
L3
L4
L3
¾"
4.1
8.2
1"
4.6
9.3
1¼"
5.1
1½"
5.6
2"
6.4
100
120
140
160
180
200
L4
L3
L4
L3
L4
L3
L4
L3
L4
L3
L4
L3
L4
4.7
9.4
5.3
10.5
5.8
11.6
6.2
12.5
6.7
13.3
7.0
14.2
7.5
14.9
5.3
10.7
6.0
12.0
6.6
13.1
7.1
14.2
7.6
15.1
8.0
16.0
8.5
16.9
10.2
5.9
11.8
6.6
13.2
7.2
14.5
7.8
15.6
8.4
16.7
8.9
17.7
9.4
18.7
11.1
6.4
12.9
7.2
14.4
7.9
15.7
8.5
17.0
9.1
18.2
9.6
19.3
10.2
20.3
12.7
7.4
14.7
8.2
16.4
9.0
18.0
9.7
19.5
10.4
20.8
11.0
22.1
11.6
23.2
Table 8.3 U-Type Expansion
27
FostaPEX:
8.6 Structural considerations
FostaPEX tubing has a fully dimensional PEX wall
with an additional outer layer of aluminum and
polyethylene. As a result of these extra layers,
FostaPEX expands considerably less than that of
standard PEX tubing and slightly more than copper
tubing (0.16" per 100' per 10°F).
Support of piping materials varies geographically.
Refer to local code for support specifications per
your location. Any bracing or clamping should be
done with supports that are designed for use with
plastic tubing that do not crush or damage the pipe
surface. The best practice is to use clamps with
integral insulators or line the clamp or hanger with
thin foam.
An approved method for expansion absorption
when using FostaPEX is through the use of a coiled
loop expansion compensator (at least every 50
feet). Do not use fitting offsets with FostaPEX as
the stiffness of FostaPEX may lead to high stress
at connections.
Coiled loop:
The coiled loop configuration calls for loops within
the piping system. The diameter of the loop (D) is
shown in the table and will increase or decrease as
the tubing in the system expands and contracts.
Note: Tubing fasteners should be secured as to not
prevent linear movement of tubing.
Figure 8.18 Pipe Braced with Brackets
D
Figure 8.17 Coiled Loop Expansion
Tube nom.
D (in)
½" FostaPEX
12"
⅝" FostaPEX
14"
¾" FostaPEX
16"
1" FostaPEX
20"
Table 8.4 Coiled Loop Expansion
28
9 Installation
9.1 General handling
FostaPEX
9.1.1 Handling ViegaPEX tubing
The properties of ViegaPEX tubing make it easy to
work with and install in most types of construction.
Some care must be taken to prevent damage to the
tubing before and during installation:
• Use care to protect both ViegaPEX and FostaPEX
tubing from physical damage during storage and
installation. Keep the tubing away from sharp
objects, open flames, etc., and do not place heavy
objects on the tubing.
• Damaged sections of tubing should be cut out
and discarded.
• Do not expose ViegaPEX tubing to sunlight
or any UV source for extended periods of
time exceeding six months for ViegaPEX
Ultra.
• FostaPEX, with its aluminum layer, is resistant to
UV light, but long-term exposure should still be
avoided.
• Do not store ViegaPEX or FostaPEX tubing
outdoors where it may be exposed to UV light.
9.1.2 Bending ViegaPEX tubing
ViegaPEX tubing can be free bent (unsupported
bend) to a minimum radius of eight times the tubing
O.D. and five times the tubing O.D. with the use of
a Viega-approved bend support. FostaPEX tubing
can be free bent to a minimum radius of eight times
the tubing O.D. and 3.5 times the tubing O.D. with the
use of a Viega tubing bender. For situations requiring
tighter bends, use elbow fittings. If bending against
a PEX coil bend direction, the bending radius is 24
times the tubing O.D. Viega does not allow the practice
of “hot bending” ViegaPEX tubing to make a tighter
bend radius.
ViegaPEX
Nominal Size*
⅜"
Minimum Radius
Free Bend
(8 x O.D.)
4"
Supported
(5 x O.D.)
2.5"
½"
5"
3.1"
¾"
7"
4.4"
1"
9"
5.6"
1¼"
11"
6.75"
1½"
13"
8.1"
2"
17"
10.6"
*ViegaPEX bend radius values were calculated using standard CTS O.D. dimensions, which are ⅛" larger than
the nominal tube size listed.
Minimum Radius
Nominal Size**
Free Bend
(8 x O.D.)
Supported
(3.5 x O.D.)
½"
5.6"
2.4"
¾"
7.5"
3.3"
1"
9.6"
4.2"
** FostaPEX bend radius values were calculated using
the actual O.D. dimensions, which include the additional
aluminum and PE layers.
Table 9.2 FostaPEX Bend Radius
Minimum bending radius
for ViegaPEX tubing
OD
RaBen
d d
R ius
Figure 9.1 Bend Radius
To reduce damaging stress on Viega PEX fittings,
bend supports or tubing fasteners must be used
to anchor all bends made close to fittings. Support
must be provided for tubing bends located closer
to fittings than distance “L” in table below. (See the
diagrams below for typical installation examples.) Since
FostaPEX will maintain its shape once bent, supports
may not be necessary. However, support must be used
at the “L” distance while making the bend.
Tubing size
Maximum distance from fitting to bend
⅜" PEX
L = 6 inches
½" PEX
L = 8 inches
¾" PEX
L = 10 inches
1" PEX
L = 12 inches
1¼" PEX
L = 14 inches
1½" PEX
L = 16 inches
2" PEX
L = 18 inches
Table 9.3 Tubing Support Distances
Using a bend support
near a Viega PEX
connection to reduce
stress on fitting
Using a tubing fastener
near a connection
to support bend and
reduce stress on fitting
L
L
Table 9.1 ViegaPEX Bend Radius
Figure 9.2 Installation Examples
29
9.1.3 Support ViegaPEX tubing
Use only plastic or plastic coated tubing
supports. Metal supports are not
recommended. They may damage the tubing.
In risers or vertical runs, ViegaPEX and FostaPEX
tubing should be attached with suspension clips or
an approved plastic insulator at each floor or ceiling
penetration, and every four feet in between (see below).
When installing ViegaPEX tubing, leave a small amount
of slack between fasteners to account for tubing
contraction.
Note that ViegaPEX tubing will expand or contract 1.1"
per 100' for every 10°F of temperature change. In long
straight runs, allow adequate clearance for this. (See
“Thermal expansion compensation” on page 23.)
The aluminum layer in FostaPEX reduces expansion
and contraction so that it expands only 0.16" per 100'
for every 10°F of temperature change. This makes it
ideal for locations where expansion must be minimized.
Tubing should be allowed freedom to move slightly
as it expands. Do not clip it tightly into place or locate
it where it will be tightly constrained. Use suspension
clips or an approved plastic insulator where tubing
passes through studs or joists where abrasion and
noise is a concern. (See illustrations to right.)
ViegaPEX tubing shall be fastened at a minimum
interval noted in the below table for horizontal and
vertical support.
PEX Size
Horizontal
Vertical
Base of each
floor with
mid-level
guide
ViegaPEX
Ultra
½" - 1"
32" O.C.
1¼" - 2"
48" O.C.
FostaPEX
½" - 1"
32" O.C.
spacin
g per
table
9.4
Figure 9.3 Tubing supported with U-clip or lock clip
fasteners on horizontal runs
Mid-level
Guide
Table 9.4 PEX Support
Suspension clips are required for metal
studs and optional for wood studs
Use nailing plates to protect tubing from
nails and screws where it passes through
wood studs.
Figure 9.4 J-clamp or lock clip fasteners used to
support tubing in vertical runs between floors
Some model codes may reference different
support spacing intervals for plastic tubing.
Always refer to local code for approved
spacing requirements that exceed the ones
referenced in this manual.
Figure 9.5 Suspension clip fasteners used to protect
tubing from abrasion when passing through steel studs
30
9.1.4 PEX hangers
9.1.4.3 PEX support trays
There are a several methods for hanging pipe
from a ceiling surface that varies based on the
construction type being used. Below are some
examples of typical methods used with PEX tubing.
PEX support trays or channels can be used with
clevis hangers and/or insulated ring clamps to help
reduce the number of support hangers that are
required for hanging PEX tubing. Refer to the tray or
channel support supplier for recommended hanger
spacing.
9.1.4.1 Trapeze hangers
Trapeze hangers are typically used for multiple
runs of tubing going to a similar location. These
are attached to the ceiling by threaded rods using
female threaded anchors (in wood or cement) or
beam clamps for I-Beam type construction. There
is a variety of clamps designed for use with PEX
tubing that are compatible with Uni-strut supports.
9.1.4.4 Pipe labels
When pipe labels are required, it is acceptable to
place flexible, pressure-sensitive stickers directly
on Viega PEX tubing and/or on jacketed insulation
that is installed over the tubing. If label adhesion is
an issue, zip ties can be used to assure long-term
placement. Refer to local code for required pipe
labeling and placement.
9.1.5 Noise and water hammer in PEX systems
Figure 9.6 Typical PEX tubing support for trapeze hanger
9.1.4.2 Clevis / tear drop hangers
Clevis and/or tear drop hangers are commonly
used to support individual runs of piping. These are
attached to the ceiling or support beam by a threaded
rod with female anchor or beam clamp, respectively.
Hangers shall have a rubber or foam lining when used
with PEX tubing. No lining is necessary with PEX
protected with jacketed insulation.
Figure 9.7 Typical PEX tubing support for clevis hangar
As with all plumbing materials under some
operating conditions, water hammer can occur in
PEX plumbing systems. The inherent flexibility of
ViegaPEX Ultra drastically reduces the magnitude of
pressure surges compared with metallic plumbing
materials. Damage to plumbing components in a
PEX system due to these pressure surges is highly
unlikely, although noise can sometimes result.
Fortunately, there are solutions to minimize or
eliminate water hammer noise.
• Install fixtures that are not water hammer
prone. As a general rule, two-handle fixtures
are less likely to cause hammer than singlehandle fixtures. Single-handle shower valves,
which rotate to close and therefore are difficult
to close quickly, might be good choices.
• Clamping or strapping more frequently may
help prevent tubing noise. It is important that
the tubing not be in contact with wallboard,
forced air ducts or other high-resonance
articles. Insufficiently or improperly clamped
or strapped tubing may move during fixture
operation and hit against these surfaces.
• Install a water hammer arrestor at fixtures
where noise is a problem. A water hammer
arrestor (AA sized) installed as close as possible
to the fixture on the cold-water side only will
eliminate the source of the noise (the pressure
wave). It should be noted that even with an
arrestor, tubing that is clamped or strapped
insufficiently may still hit against something as it
moves slightly when the water flow is stopped.
31
• Avoid operating fixtures in such a way that
causes near instantaneous shutoff. Simply
closing fixtures in a less abrupt manner can
eliminate hammer noise.
9.1.6 Chemical compatibility
As with any product, misapplication of any
chemical could result in unwanted results or
damage to other household components,
including the plumbing system, per the typical
warnings accompanying the products.
9.1.6.1 Spray foams
9.1.7 Freeze protection
When penetrations must be sealed for air infiltration
purposes, there are several options available. Use
a good grade of silicone, acrylic or siliconized
acrylic caulking. DO NOT use oil-based caulks.
Most expanding foams and open- or closed-cell
pipe insulation are good sealing materials and may
be used in direct contact with PEX tubing. Other
materials may be used provided they do not cause
short- or long-term damage to the PEX tubing.
9.1.7.1 Insulation
9.1.6.2 Termiticides / pesticides
Applications of different termiticides, pesticides
and insecticides that may come in contact with the
outer surface of our PEX products, based on our
present knowledge, should not adversely affect
the performance of ViegaPEX tubing and/or fitting
products for use in potable water distribution systems.
Because of the wide array of insect and pest
eradication products available to consumers today,
it is impossible to make a general assessment of
all available products’ impact on plastic plumbing
components. However, if utilized in accordance with
the pesticide/termiticide/insecticide manufacturers’
application guidelines, it is unlikely the products will
negatively impact Viega’s PEX tubing.
When using expanding spray foam to
insulate walls in a structure, there are
several options available. Viega suggests
using water-based or urethane-based open-cell
insulation only. DO NOT use closed-cell spray
foams. Closed-cell spray foams have the potential
to generate high temperatures during their
expansion process, especially when not applied
properly, which can damage PEX tubing. Always
follow the spray foam manufacturer’s installation
instructions and warnings.
foreign substance that includes but is
not limited to Volatile Organic Chemical
(VOC) compounds, paints, solvents,
glues, cleaners and disinfectants. Viega
products that are exposed to these
types of substances are at risk of having
failures (leaks).
32
While plastic tubing has some insulation properties
(R-value) it generally is not enough to meet most
thermal performance requirements as outlined in
code. As a general practice, anywhere metal piping
requires insulation, plastic piping will too. Always
check code for necessary insulation requirements.
9.1.7.2 Heat tape
It is an acceptable practice to use heat tape on
PEX tubing as long as it is a self-limiting type not
controlled by an external thermostat. Below is a
list of manufacturers that offer heat tapes meeting
these requirements:
• EasyHeat® /10800 series
• Heaterzone.com
• WRAP-ON / PIPE-GUARD™
• BriskHeat®
9.1.8 Freeze repair
The flexibility of ViegaPEX tubing makes it resistant
to damage from freezing. PEX tubing systems
should not be intentionally subjected to freezing.
However, if freezing occurs there are several
methods to thaw PEX tubing.
• Hot water
• Wet, hot towels
• Hand-held hair dryer
• Low-wattage electric heating tape (self limiting)
• A commercial system that pumps heated
water through a tube to the ice blockage and
returns the cooled water for reheating.
Heat must be applied directly to the frozen
tubing section. Temperatures on tubing shall
not exceed 180°F.
Do not use open torch or excessive heat to
thaw PEX tubing. Tubing failure or damage
can result.
9.1.9 Condensation control
As a general practice, anywhere metal piping
requires insulation for condensation control, plastic
piping will too. Always check code for necessary
insulation requirements.
Always follow local codes when installing ViegaPEX
tubing. Consult standards such as ASTM D2774:
Standard Recommended Practice for Underground
Installation of Thermoplastic Pressure Piping for further
information.
9.2 Building water service installation
Viega PEX and its related fittings are listed to the
requirements of AWWA C904 and approved for use
in water service applications. Viega offers a variety
of threaded, solder and ProPress adapters to
transition PEX to several types of piping materials
9.2.1 Installing PEX below grade as service line
ViegaPEX and FostaPEX tubing may both be used
underground and for water service piping. When
running lines underground, it is important to provide a
stable, continuous trench base to support the tubing.
Always allow sufficient slack when tubing is laid in
trenches. Snake the tubing slightly side-to-side to
provide for contraction due to temperature change.
Trench in good soil
Allow sufficient
slack when tubing
is laid in trench
Figure 9.8
Do not use blocking to support tubing. PEX tubing can
be damaged by contact with sharp objects. Ensure
that trench bottom and fill do not contain sharp rocks
or other items. In good soil conditions tubing may be
placed directly on trench bottom. In poor soil conditions
(rocky, loose, etc.) the trench should be excavated at
least six inches below the tubing level and backfilled
with appropriate material to provide a stable base
(coarse sand, pea gravel or similar).
Backfill material must be free of large rocks, glass or
other sharp objects. Provide sufficient coverage over
tubing so that expected traffic loads will not deform
tubing (consult local codes). Compact this material to at
least 6” above the tube.
Trench in poor soil
Figure 9.9 Installing PEX below grade
9.2.1.1 Trace wire
It is an acceptable practice to use trace wire to
assist with the detection of Viega underground
piping systems. Refer to local code for minimum
wire gauge and material requirements.
Do not install ViegaPEX tubing where soil is or may
become contaminated with solvents, fuels or similar
chemicals. Do not install tubing above or below septic
tanks, leach fields, pits or cesspools.
33
9.2.2 Installing PEX under the slab
When installing ViegaPEX or FostaPEXtubing in
the ground under the slab, the tubing should be
snaked from side to side in the prepared trench.
The trench bottom should be smooth and free
of rocks and debris. Lay the tubing directly on
the trench bottom. Tubing must be continuously
supported by the trench bottom. Use only
continuous lengths of tubing in or under slab.
Any connections shall be outside the slab or in an
access box.
9.2.3 Installing PEX under a roadway
ViegaPEX tubing can be installed under a roadway
as long as it is buried to the minimum frost level
depth required by local code and following proper
direct burial practices for plastic pipe.
Figure 9.11 Water Service Tubing through slab
9.3 PEX installed in slab
Elbow sleeves
protect tubing at concrete
slab penetrations
Tubing must be fastened
to the reinforcing mesh
on rebar with the use of
plastic zip ties
ViegaPEX tubing can be installed within concrete
slabs. Every effort should be made to use only
continuous lengths of tubing within the slab.
9.3.1 Sleeving requirements
All penetration points of ViegaPEX tubing run
within concrete slabs or walls shall be sleeved to
protect the tubing from expansion and contraction.
Sleeving may consist of a larger piece of plastic
tubing or open or closed cell insulation with a wall
thickness no less than 0.022" thick.
9.3.2 Sealants
PEX tubing must be sleeved at all expansion joints
and every point where it enters, exits or penetrates
the slab. For expansion joints that are to be cut,
the tubing must be dipped below the slab to
prevent damage
Use of a silicone, acrylic or siliconized acrylic caulk
may be necessary to seal any voids between PEX
tubing and the sleeving material. Most canned
expanding foams and open- or closed-cell pipe
insulation are also good sealing materials and may
be used in direct contact with PEX tubing. DO NOT
use oil-based caulks or closed-cell spray foams!
Figure 9.10 Installing PEX under the slab
34
Figure 9.9
9.4 PEX risers
Viega PEX tubing can be used as a riser to supply
multiple floors with hot and cold water. To help
control thermal expansion between multiple floors
you should use a mid-level guide at every floor and
riser clamps at the following intervals:
Code approved floor assembly
Hot lines
Use clamps above and below floor every other floor
with a single clamp above the floor in between.
Cold lines
Use clamps above and below floor every 4th floor
with a single clamp above floor each floor between.
CTS riser clamps
Mid-level guide
Firestop penetrations
as required by code
at each floor
Figure 9.12
35
9.4.1 Support
There are a variety of clamps and hangers to
support PEX tubing risers to support members or
wall surfaces. Always use products designed for
use with plastic tubing that have no sharp edges or
can potentially flatten or crush PEX tubing.
9.4.1.1 Clamps
Viega offers two types of multi clips that will fit up
to 2" PEX tubing. One is designed to mount to a
wall surface and comes with a mounting screw.
The other type is designed to insert into a Unistrut support bar. Lock clips, tubing insulators and
suspension clips are also available for use with PEX
tubing. Ring clamps, clevis or tear drop hangers
shall have a rubber or protective lining when used
with PEX tubing.
36
Figure 9.13
9.5 Fire resistant construction
9.5.1 U.S. listings
9.5.1.1 Plenum rating
ViegaPEX tubing has been tested and listed to the ASTM E84 with the following ratings:
ASTM E84 Plenum Ratings / Listing
Manufacturer
Products Listed
Flame Spread
Smoke Development
Limitations
Viega
⅜" to 2" PEX
25 or less
50 or less
½" minimum insulation thickness,
no spacing limitations
Note: Listings include fitting connections in line when covered by insulation.
Table 9.5 U.S. Plenum Rating
9.5.1.2 Fire resistant construction
ViegaPEX has the following listings for each respective construction type:
ANSI/UL 263 and ASTM E119
Construction Type
Assembly Type
Design No.
Wood Frame Construction
Floor / Ceiling
M517
Walls
VL/FWDP 60-01
Non-combustible Concrete /
Steel Construction
Floor / Ceiling
VL/FWDP 120-01
VL/FWDP 120-02
Walls
VL/FWDP 60-02
Table 9.6 U.S. Fire Resistant Construction
US: Wood-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - ANSI/UL 263
ITS Design No. VL/FWDP 60-01; ITS Design No. VL/FWDP 120-01
Non-rated wall / load-bearing wall assembly,
maximum stud spacing 16" on center.
Mid-story guide
Maximum weight of Viega PEX products* shall
be 11 lb. or 1.3 lb. per ft. per stud cavity.
Polymer bend supports copper stub-outs, drop ear
adapters or other Viega-approved supports using a
metal or wooden cross support member
2 hour fire-rated floor/ceiling assembly min. 6" thick
reinforced concrete with PEX tubing installed (max.
density of PEX expressed as a percentage of
concrete slab cross sectional area is 14.8%)
Firestop per ASTM E814 requirements.
See Section “9.5.3 Firestopping systems” on
page 43 for compatible firestop systems
*Viega products include manifolds,
fittings, tubing and supports
Figure 9.14
37
US: Wood-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - ANSI/UL 263
Maximum weight of Viega PEX
products* shall be 11 lb. or 1.3 lb.
per ft. per stud cavity.
Mid-story guide
Firestop
ASTM
E814
requirements.
Firestopper
ASTM
E814
requirements.
See
Firestopping
systems”
page
systems.
SeeSection
Section“9.5.3
9.6.3 for
compatible
firestop on
43 for compatible firestop systems
Viega PVC bend support / sleeving
*Viega products include manifolds, fittings, tubing and supports
Figure 9.15
US: Steel-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - ANSI/UL 263
Mid-story guide
Firestop
per
ASTM
E814
requirements.
Firestop
per
ASTM
E814
requirements.
See
Section
“9.5.3
systems”
on
See
Section
9.6.3
for Firestopping
compatible firestop
systems
Figure 9.16
38
US: Steel-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - ANSI/UL 263
Mid-story guide
Firestop
Firestopper
perASTM
ASTME814
E814requirements.
requirements.
See
systems” on page
SeeSection
Section“9.5.3
9.6.3 Firestopping
for compatible
43
for compatible
firestop
systems.firestop systems
Figure 9.17
US: Wood-Stud Wall Assembly and Wood Floor / Ceiling Assembly - ANSI/UL 263
ITS Design No. VL/FWDP 60-02; UL Design No. M517
2" x 4" wood studs 16"
on center. Top plate
consists of two 2" x 4"s
product* shall be 11 lb. or 1.3
lb. per ft. per stud cavity
Viega PEX riser up to 2"
Install additional bracing
maximum 42" on center, in
stud cavities with PEX
tubing as support
Firestop
Firestop per
per ASTM
ASTM E814
E814,requirements.
See
“9.5.3
Firestopping
systems”
referSection
to Section
9.6.3
for
on page 43 for compatible firestop
compatible firestop systems
systems
Bottom plate consists
of one 2" x 4" stud
Subfloor
Maximum hanger spacing per Table 9.4
Figure 9.18
39
9.5.2 Canadian listings
9.5.2.1 Plenum rating
ViegaPEX tubing has been testing and listed to the CAN/ULC S102.2 with the following ratings:
CAN/ULC S102.2 Plenum Ratings / Listings
Manufacturer
Products Listed
Flame Spread
Smoke Development
Limitations
Viega
⅜" to 2" PEX
25 or less
50 or less
½" minimum insulation thickness,
no spacing limitations
Viega
⅜" to ½" PEX
25 or less
50 or less
No spacing limitations
Note: Listings include fitting connections in line when covered by insulation.
Table 9.7 Canadian Plenum Ratings
9.5.2.2 Fire resistant construction
ViegaPEX has the following listings for each respective construction type:
CAN/ULC - S101
Construction Type
Assembly Type
Wood Frame Construction
Floor / Ceiling
M522
Walls
VL/FWDP 60-01
Floor / Ceiling
VL/FWDP 120-01
Non-combustible Concrete /
Steel Construction
Design No.
VL/FWDP 120-02
Walls
VL/FWDP 60-02
Table 9.8 Canadian Fire Resistant Construction
Canada: Wood-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - CAN/ULC S101
Mid-story guide
Firestop
CAN/UL
115
requirements.
Firestop
CAN/UL
115
requirements.
See
Section
“9.5.3
systems” on
See
Section
9.6.3
for Firestopping
compatible firestop
Figure 9.19
40
Canada: Wood-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - ANSI/UL 263
Mid-story guide
Firestop CAN/UL 115 requirements.
See Section 9.6.3 for compatible firestop systems.
Figure 9.20
Canada: Steel-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - CAN/ULC S101
Mid-story guide
adapters or other Viega approved supports using a
FirestopCAN/UL
CAN/UL115
115requirements.
requirements.
Firestop
SeeSection
Section9.6.3
“9.5.3
systems” on
See
forFirestopping
compatible firestop
Figure 9.21
41
Canada: Steel-Stud Wall Assembly and Concrete Floor / Ceiling Assembly - ANSI/UL 263
Mid-story guide
Firestop per CAN/UL 115 requirements.
See Section 9.6.3 for compatible firestop systems.
Figure 9.22
Canada: Wood-Stud Wall Assembly and Wood Floor / Ceiling Assembly - CAN/ULC S101
2" x 4" wood studs 16"
on center. Top plate
consists of two 2" x 4"s
product* shall be 11 lb. or 1.3
lb. per ft. per stud cavity
Viega PEX riser up to 2"
Install additional bracing
maximum 42" on center, in
stud cavities with PEX
tubing as support
Firestop per ASTM E814 requirements.
Firestop
per “9.5.3
ASTM Firestopping
E814,
See
Section
systems”
refer
to Section
9.6.3 for firestop
on
page
43 for compatible
compatible firestop systems
systems
Bottom plate consists
of one 2" x 4" stud
Subfloor
Maximum hanger spacing per Table 9.4
Figure 9.23
42
9.5.3 Firestopping systems
9.5.3.1 Caulking
Most building codes require the use of a firestopping compound when tubing penetrates a fire-rated wall.
There are a number of firestopping compounds identified as water based, acrylic or latex that have been
listed for use with PEX tubing. The information provided on firestopping is to assist users in selecting a
firestop compound for use with ViegaPEX tubing and is not intended as a warranty of these compounds or
an endorsement of their use. The firestop materials listed below are known to have been third-party tested
with PEX tubing. It is the responsibility of the user to determine the suitability of these or any products
for the intended application and to install the compounds in accordance with the product’s installation
instructions.
RectorSeal®
Concrete Assemblies
Wood-stud / steel-stud Assemblies
Assembly Types
1-hour
2-hour
2-hour
3-hour
Wall
Caulk
Tube size
Floor /
ceiling
W-L-2121
MC Wrap
1"
W-L-2209
MC 1000
1"
W-L-2262
MC 150+
W-L-2342
Caulk
Tube size
F-C-2192
MC 1000
1"
F-C-2212
MC 150+
1"
1"
F-C-2329
MC 150+
1"
MC 1000
2"
F-C-2298
MC 1000
1"
W-L-2373
MC 150+
1"
F-C-8015
MC pipe
collar
1"
W-L-2402
MC 1000
1"
F-C-8039
MC 350i
1"
W-L-2430
MC 1000
2"
W-L-2457
MC 350i
2"
W-L-2121
MC Wrap
1"
W-L-2209
MC 1000
1"
W-L-2262
MC 150+
1"
W-L-2342
MC 1000
2"
W-L-2373
MC 150+
1"
W-L-2402
MC 1000
1"
W-L-2430
MC 1000
2"
W-L-2457
MC 350i
2"
W-J-2025
MC 1000
1"
F-A-2171
MC 1000
1½"
W-J-2122
MC 1000
1"
W-J-2142
MC 150+
1"
W-J-2162
MC 1000
1½"
W-J-2180
MC 1000
2"
W-J-2197
MC 350i
1"
C-AJ-2176
MC pipe
collar
1"
C-AJ-2176
MC pipe
collar
1"
C-AJ-2628
Sleeve
2"
C-AJ-2628
Sleeve
2"
C-AJ-2119
MC 1000
1"
C-AJ-2119
MC 1000
1"
Table 9.9 RectorSeal Caulking
43
3M™
Assembly Types
1-hour
Caulk
Tube size
Floor /
ceiling
Caulk
Tube size
PHV-12004
CP 25WB+
1" (x3)
F-C-2039
CP 25WB+
1"
PHV-12011
CP 25WB+
1"
F-C-2240
CP 25WB+
1"
W-L-2091
CP 25WB+
1"
F-C-2343
CP 25WB+
1/2"
W-L-2146
CP 25WB+
1" multiple
F-C-2344
CP 25WB+
1/2" (x2)
W-L-2173
FB1000NS
3/4"
F-C-2391
CP 25WB+
2"
W-L-2448
CP 25WB+
2"
F-E-2002
CP 25WB+
1"
W-L-2483
CP 25WB+
1"
F-E-2012
CP 25WB+
1"
W-L-2543
FB-3000
WT
2"
F-E-2040
CP 25WB+
2"
W-L-2547
CP 25WB+
2"
PHV-12004
CP 25WB+
1" (x3)
PHV-12004
CP 25WB+
3"
PHV-12004
CP 25WB+
3"
PHV-12011
2-hour
Concrete Assemblies
Wall
2-hour
1"
W-L-2090
FB-3000
WT
1"
W-L-2091
CP 25WB+
1"
W-L-2146
CP 25WB+
1" multiple
W-L-2448
CP 25WB+
2"
W-L-2483
CP 25WB+
1"
W-L-2543
FB-3000
WT
2"
W-L-2547
CP 25WB+
2"
C-AJ-2510
FB-3000
WT
2"
C-AJ-2510
FB-3000
WT
2"
C-AJ-2536
CP 25WB+
2"
C-AJ-2536
CP 25WB+
2"
PHV-12004
CP 25WB+
1" (x3)
F-A-2115
FB-3000
WT
1" (x3)
PHV-12011
CP 25WB+
1"
PH-120-10
CP 25WB+
1"
C-AJ-2213
CP 25WB+
1"
PHV-12004
CP 25WB+
1" (x3)
C-AJ-2378
CP 25WB+
1"
PHV-12011
CP 25WB+
1"
W-J-2110
CP 25WB+
1"
W-J-2232
CP 25WB+
2"
Table 9.11 3M Caulking
44
Hilti®
Concrete Assemblies
Assembly Types
1-hour
2-hour
2-hour
3-hour
Wall
Caulk
Tube size
Floor /
ceiling
Caulk
Tube size
W-L-2186
FS-ONE
1"
F-C-2081
FS-ONE
1"
W-L-2235
CP 648 wrap
1"
F-C-2230
FS-ONE/CP
648-E
1"
W-L-2466
FS-ONE
1"
F-C-2310
FS-ONE
1"
W-L-2467
FS-ONE
1"
F-C-2334
FS-ONE
1"
W-L-2474
CP 648 wrap
2"
F-C-8038
FS-ONE/CP
606
multiple
F-C-8044
CP CFS-S SIL
SL
multiple
W-L-2186
FS-ONE
1"
F-C-2081
FS-ONE
1"
W-L-2235
CP 648 wrap
1"
F-C-2310
FS-ONE
1"
W-L-2466
FS-ONE
1"
W-L-2467
FS-ONE
1"
W-L-2474
CP 648 wrap
2"
C-AJ-2170
FS-ONE
1"
C-AJ-2170
FS-ONE
1"
C-AJ-2407
FS-ONE
1"
C-AJ-2407
FS-ONE
1"
C-AJ-2647
FS-ONE
1"
C-AJ-2647
FS-ONE
1"
W-J-2071
FS-ONE
1"
F-B-2040
CP 680-P /
CP
2"
F-B-2041
CP 680-P /
CP
2"
F-A-2142
CP 680-P /
CP
½" multiple
C-BJ-2028
FS-ONE
1"
C-BJ-2040
FS-ONE
2"
C-BJ-2041
FS-ONE
1"
Table 9.10 Hilti Caulking
9.5.3.2 Support collar systems
There are a variety of cast-in place sleeves
available when penetrating PEX tubing through
floor / ceiling concrete slabs. It is best to contact
the manufacturer of these support collar systems
for detailed installation information.
For additional installation support and/or assistance
with selecting the appropriate firestop system
for your application, contact one of the firestop
manufacturers listed below.
• Rector Seal®
800-231-3345
http://www.metacaulk.com/
• Hilti
800-879-8000
https://www.us.hilti.com/firestop
• 3M Fire Protection Products
800-328-1687
http://solutions.3m.com/wps/portal/3M/en_US/
fire-protection-systems-NA/firestop/
45
9.6 System Testing and Flushing
9.6.1 General
Upon the completion of installing a Viega PEX
plumbing system, a hydrostatic (potable water)
pressure test shall be conducted. If potable water is
not available, or the potential for a freezing condition
exists, compressed air* (air or nitrogen) testing and/
or the use of an RV antifreeze** solution are also
acceptable methods for pressure testing.
* Use air testing only if approved by local code or
the Authority Having Jurisdiction (AHJ)!
** RV antifreeze shall be drained and flushed from
all portions of the plumbing system prior to
consumer use.
Always refer to local plumbing code for pressure
testing requirements and approved methods
specific to plastic plumbing systems. If none
are specified, refer to Table 9.12 for acceptable
methods, test pressures and durations.
NOTICE - ManaBloc VALVE INFORMATION!
Opening a port valve to an empty or
unpressurized distribution line may cause
valve damage.
WATER TESTING SHALL BE AVOIDED
DURING FREEZING CONDITIONS. UNDER NO
CIRCUMSTANCES SHALL THE SYSTEM BE
TESTED AT TEMPERATURES LOWER THAN
10˚F (-12˚C).
FOLLOW ANTIFREEZE MANUFACTURER’S
INSTRUCTIONS FOR CONCENTRATIONS.
Use only non-toxic antifreeze approved for
drinking water systems.
NOTE: If such a solution is used, the antifreeze solution
must be sufficiently concentrated to withstand the
lowest temperature encountered while the testing fluid
is in the system. Antifreeze solutions should be purged
and the system flushed with potable water prior to
consumer use.
WARNING! PRESSURES USED IN
TESTING CAN BLOW UNMADE OR
INCOMPLETE CONNECTIONS APART
WITH TREMENDOUS FORCE!
This force is many times greater when air is used as
a test medium. To reduce the risk of personal injury,
ensure that all connections are completed before
testing. Use only the pressure and time required to
determine that the system is leak free.
To prevent potential valve damage or failure, open the
port valves before filling and pressurizing the lines. The
force of water rushing to fill an empty line can cause
the valve’s seal to “clip off,” resulting in incomplete
sealing or complete valve failure.
CARE must be exercised when opening a port valve to
an empty or unpressurized line. The fixture to which the
line is connected should be in the OFF position and the
valve must be opened slowly until water starts to flow
into the line.
DO NOT CONTINUE to open the valve until the line is
full and pressurized. Open the valve fully only after the
line is up to system pressure. The fixture can then be
opened to purge the line of air.
Valve stems are replaceable. Order Part Number 51602.
Testing Viega PEX Water Systems
Test Method Min/Max Duration (Min) Max Pressure (psi) Min Pressure (psi) Allowable Variance (psi)
Water
15 min/1 hr
100
40
N/A
Air
15 min/1 hr
100
40
8*
* If the pressure in the system declines more than 8 psi during the 15-minute to one-hour period, repressurize the system to the
original test pressure and retest. If the system pressure declines more than 8 psi again during the test period, test the distribution line
test caps or any other fittings in the system with the approved leak-detect solution.
NOTE: Some plumbing fixtures may not withstand test pressures greater than 80 psi. Consult fixture manufacturer’s instructions for pressure
limitations or plug all distribution lines at the fixture end. The system shall, at a minimum, withstand the test pressure, without leaking, for a
period of 15 minutes.
Table 9.12
46
9.6.2 Air testing
Air testing of a Viega PEX plumbing system shall
use the checklist provided to ensure safety.
It is the responsibility of the installer to
read and understand the below pressure
testing criteria and all safety precautions.
Compressed air can store extremely high
energy as compared to compressed water
systems. Failure to follow these steps could result
in personal injury, death and/or property damage.
Preparing for air pressure test:
 Notify other trades that air pressure test will
be conducted on the plumbing system. Only
qualified personnel should be present during the
system testing.
 Use only compressed air or nitrogen that is free
of any kind of lubricating oils.
 Do not conduct pressure testing overnight or if a
large temperature change is anticipated.
 Before pressurizing the system, conduct a visual
inspection to ensure proper connections have
been made throughout the plumbing system.
 All personnel involved in the pressure testing
shall wear, at a minimum, eye and hearing
protection. It is recommended the person
applying the pressure to the system wear a full
face shield.
 Only Viega PEX plumbing system components
(tubing/fittings/manifolds) shall be pressure
tested. All other system components (water
heaters and fixtures) shall be isolated from the
pressure test.
 Contact the inspector and schedule the pressure test.
Pressurizing the system:
 Verify no other trades are present prior to
starting the pressure test. Only qualified testing
personnel should be present during pressure test.
 Introduce pressure into the system as outlined in
the stages below.
Stage 1: Gradually increase system pressure to 10
psi (approx. 30-sec. duration).
• Wait for 10 minutes before inspecting
pressure gauge.
• If pressure holds steady, continue to Stage 2.
• If pressure falls over the test period, look for
potential leaks with an approved leak-detect
solution. Once system pressure is completely
relieved and the leak is fixed, restart test
procedure.
Stage 2: Gradually increase system pressure to 50
psi (approx. 1-min. duration).
• Wait for 10 minutes before inspecting
pressure gauge.
• If pressure holds stable, continue to Stage 3.
• If pressure falls over the test period, look for
potential leaks with an approved leak-detect
solution. Once system pressure is completely
relieved and the leak is fixed, restart testing
procedure from beginning.
Stage 3: Gradually increase system pressure to
100 psi (approx. 1-min. duration).
• Inspect gauge pressure over next 10-minute
period to verify pressure has not decreased
more than the allowable variance noted in
Table 9.12.
• If pressure variance allowed is not exceeded,
the system test has passed.
• If pressure decreases more than the
allowable variance, the test has failed.
Apply approved leak-detect solution (see
“9.7.3 Leak detection” below) on fitting
and/or manifold connections to isolate the
location of the leak. Once system pressure is
completely relieved and the leak is fixed, start
testing procedure from beginning.
Completing the air test:
 Depressurize system.
• Use of the same safety equipment applies to
these steps.
• Slowly bleed off any remaining air pressure
from system (approx. 1-min. duration).
• Notify other trades the test is complete and
work area is safe to occupy.
• Document the time and date test was
completed and the pressure and duration of
the test.
9.6.3 Leak detection
Viega has identified the leak detect solutions listed
below as being compatible for use with Viega PEX
Press system components. Consult leak detect
manufacturer for proper application and product
instructions. To determine the compatibility of other
leak detect solutions not listed below, contact
Viega Technical Services prior to their use.
• megabubble® Leak Detector
• Oatey® All Purpose Leak Detector
• Snoop Liquid Leak Detector
As an alternative leak detect a mixture of Original
Palmolive Green™ dishwashing soap (#4610046200) or Palmolive Ultra™ (#356140 or 46128)
mixed with potable water at a ratio of two ounces
of soap to one gallon of water (mix Ultra at a ratio
of 1.5 ounces per gallon) may be used.
NOTE: If the solution does not show a leak on
any of the caps or fittings, isolate the ManaBloc
by turning the valves to the “OFF” position,
repressurize if needed and apply the same solution
to the ManaBloc manifold components.
47
9.6.4 Disinfection
Public potable water distribution systems today
generally require some form of residual disinfection
to greatly eliminate or render harmless waterborne
pathogens such as E-coli and Legionella. Some
commonly used disinfection methods include the
use of chlorine, chloramines and chlorine dioxide at
levels not to exceed EPA established levels. These
can be used at the water supply / municipality
as a primary treatment and within a building as a
secondary treatment.
Viega LLC does not recommend use of ViegaPEX
tubing as part of any potable water distribution
system in buildings where chlorine dioxide is used
as a secondary disinfection or where injection
systems using chlorine dioxide are present. This
is based on the limited industry data available for
the long-term effects of chlorine dioxide on PEX
tubing at allowable controlled levels. This does not
include the disinfection / commissioning of a new
or repaired system.
Local codes may require system disinfection.
When no other method is available, follow the time
limitations and exposure levels shown below.
1. Use a chlorine solution and one of the
exposure durations listed below:
Concentration
Period
Authority
200 PPM
3 hours
IPC/UPC®
50 PPM
24 hours
IPC/UPC®
5. After the solution has been in the system for
the time required by the Authority Having
Jurisdiction (AHJ) or the exposure durations
listed in Step 1, the system shall be flushed
completely with potable water until present at
each fixture.
6. The system must be purged or drained of all
water or protected from freezing.
FAILURE TO FLUSH THE SYSTEM
NOTICE!
To prevent reduced service life of system
components, disinfection solutions shall
not be allowed to stand in the system
longer than 24 hours. Thoroughly flush
the system with potable water after
disinfection.
9.6.4.1 California flushing requirements
The State of California requires all installations of
PEX piping where it is the initial plumbing system
installed in new construction shall be flushed twice
over a period of at least one week. The piping
system shall be first flushed for at least 10 minutes
and then filled and allowed to stand for no less
than one week, after which all the branches of the
piping system must be flushed long enough to
fully empty the contained volume. This shall not
apply to installations of PEX pipe where it replaces
an existing tubing system of any material. At the
time of fill, each fixture shall have a removable tag,
shown on the right.
Table 9.13
2. Mix the disinfection solution thoroughly before
adding it to the system.
3. The chlorine solution must reach all parts of the
system. Open all fixtures (both sides) and flow
water until a chlorine smell is present. As an
alternative, chlorine test tablets can be used to
detect chlorine at each fixture.
4. The chlorine source for the solution can be, but is
not limited to, the following:
Chlorine
Source
Laundry
bleach
Table 9.14
48
% Active
Form
Chlorine
5.25
Liquid
Amount Per 100
Gallon Water
for a 200 PPM
solution
3 pints (48 oz.)
Figure 9.23
10 Installer Checklist
10.1 Installers checklist for Viega PEX
systems
In the event there is a conflict between the contents
of this list or any applicable code, the code or the
instructions, whichever is more restrictive, shall
govern.
System components
Tubing markings
o ASTM F876 Cross-linked polyethylene (PEX)
tubing.
o ASTM F877 Cross-linked polyethylene
distribution systems (connection listed with
manufacturer-supplied fitting and PEX tubing).
Fitting markings
o ASTM F877 Cross-linked polyethylene
distribution systems (connection listed with
manufacturer-supplied fitting and PEX tubing).
Joints and connections
o Tube end cuts shall be cut square and free of
burrs.
o Connection shall be assembled per
manufacturer’s product instructions.
o Incorrectly assembled fittings shall be cut out
and replaced.
General installation recommendations
o Contraction: Allow 1/8-inch slack per foot of PEX
tubing.
o PEX may be loosely bundled (NOT TAPED).
o Do not bend PEX tubing tighter than the
manufacturer’s recommended minimum bending
radius.
o Install minimum 18 inches of metallic or other
approved material piping between gas water
heater and PEX tubing connections.
o PEX must be free of gouges, cuts, deep
scratches, tar, kinks, grease, flux and fading or
discoloration.
o Protective sleeves or bushings shall be used with
metal studs.
o Use clamps or straps at the required minimum
“L” spacing between a tubing bend and PEX
connections.
o Minimum horizontal support shall be per Table 9.4.
o Vertical tubing shall be supported at every floor
and at the midpoint between floors.
o Supports/clamps shall not restrict the movement
of PEX tubing.
o Supports/clamps shall not pinch, cut, kink or
damage tubing.
o Use only hangers and straps recommended for
plastic tubing.
o Tubing passing through slabs or foundations
shall have a protective sleeve.
o Tubing shall be protected from nail damage.
o Transition connections shall be made with
fittings approved for that purpose.
o PEX shall be located at least 6 inches horizontally
and 12 inches vertically from sources of high heat.
Testing
o Test pressure shall be at least equal to normal
system working pressure, but not less than 40
psi and not greater than 100 psi.
o Test duration shall not be less than 15 minutes.
o A slight drop in pressure after 2 hours is normal.
49
11 Warranty
VIEGA® LLC PEX WATER SYSTEMS LIMITED WARRANTY
Subject to the conditions and limitations in this Limited Warranty, VIEGA LLC (Viega) warrants to owners of real
property in the United States and Canada that the components in its PEX Plumbing Systems (as described below)
when properly installed by licensed plumbers in potable water systems, under normal conditions of use, shall be free
from failure or leak caused by manufacturing defects for a period of ten (10) years from date of installation.
Viega PEX Plumbing Systems and components covered by this ten-year warranty are:
ViegaPEX™ and ViegaPEX ULTRA cross-linked polyethylene (PEX) tubing, FostaPEX®, ManaBloc®, MiniBloc™ or polymer or copper manifolds sold by Viega and approved connections sold by Viega installed as a manifold plumbing system.
ViegaPEX and ViegaPEX ULTRA cross-linked polyethylene (PEX) tubing or FostaPEX installed with PEX metal or polymer press fittings and PEX Press sleeves sold by Viega installed as a system.
ViegaPEX and ViegaPEX ULTRA cross-linked polyethylene (PEX) tubing and ASTM F1807 metal crimp insert fittings sold by Viega and ASTM F2159 PolyAlloy™ crimp fittings sold by Viega installed with copper crimp rings as a system.
Viega does not extend any warranty on its components used in systems with tubing, fittings, manifolds, or press
sleeves not sold by Viega or installed by other than a licensed plumber. In addition, the warranty does not apply if
distribution lines and their connections to manifold plumbing systems sold by Viega are not ViegaPEX or FostaPEX
tubing or approved connections sold by Viega.
Power tools and jaws used with PEX Press fittings are warranted by the manufacturer and Viega extends no separate
warranty on those tools or jaws. Viega warrants that PEX Press hand tools sold by Viega, under normal conditions of
use, shall be free from failure caused by manufacturing defects for a period of two (2) years from date of sale. Viega
warrants that PEX Crimp hand tools and tubing cutters sold by Viega, under normal conditions of use, shall be free
from failure caused by manufacturing defects for a period of twelve (12) months from date of sale.
Viega warrants that properly installed PEX valves, PEX lav and closet risers and riser accessories manufactured and/
or sold by Viega shall be free from failure caused by manufacturing defects for a period of two (2) years from date of
installation.
Under this limited warranty, you only have a right to reimbursement if the failure or leak or resulting damage resulted
from a manufacturing defect in the products covered by this warranty and the failure or leak or resulting damage
occurred during the warranty period. You do not have a remedy or right of reimbursement under this warranty and the
warranty does not apply if the failure or leak or resulting damage is caused by (1) components in the plumbing system
other than those manufactured or sold by Viega; (2) not designing, installing, inspecting, testing, or operating the
system in accordance with Viega’s installation instructions at the time of the installation, applicable code requirements
and good plumbing practices; (3) improper handling and protection of the product prior to and during installation,
inadequate freeze protection, exposure to water pressures or temperatures in excess of the limitations on the tubing
or application of unauthorized or harmful solvents or chemicals; (4) acts of nature such as earthquakes, fire, flood or
lightning.
In the event of a failure or leak in the system, it is the responsibility of the property owner to obtain and pay for
repairs. Only if the warranty applies will Viega be responsible for reimbursement under this warranty. The part or
parts which you claim failed should be kept and Viega contacted at the address below* or by telephoning 800-9769819 within thirty (30) days after the failure or leak and identifying yourself as having a warranty claim. You should be
prepared to ship, at your expense, the product which you claim failed due to a manufacturing defect, document the
date of installation, and the amount of any claimed bills for which you claim reimbursement. Within a reasonable time
after receiving the product, Viega will investigate the reasons for the failure, which includes the right to inspect the
product at Viega and reasonable access to the site of damage in order to determine whether the warranty applies.
Viega will notify you of the results of this review.
In the event that Viega determines that the failure or leak and any resulting damages were the result of a
manufacturing defect in the products and occurred during the time periods covered by this warranty, Viega will
reimburse the property owner for reasonable repair or replacement charges to include drywall, flooring and painting
costs as well as damages to personal property resulting from the failure or leak. VIEGA SHALL NOT BE LIABLE FOR
CONSEQUENTIAL ECONOMIC LOSS DAMAGES UNDER ANY LEGAL THEORY AND WHETHER ASSERTED BY
DIRECT ACTION, FOR CONTRIBUTION OR INDEMNITY OR OTHERWISE.
THE ABOVE LIMITED WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. IF FOUND APPLICABLE, ANY IMPLIED WARRANTIES ARE LIMITED TO THE DURATION OF THE TIME
LIMITS SET OUT IN THIS WRITTEN WARRANTY. Other than this limited warranty, Viega does not authorize any
person or firm to create for it any other obligation or liability in connection with its products. This written warranty
applies for the full term of the applicable warranty regardless of any change of ownership in the property.
Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations on the
duration of implied warranties in certain types of transactions, so the above exclusion or limitations may not apply to
you. This limited warranty gives you specific legal rights and you also may have other rights which vary from state to
state. This warranty shall be interpreted and applied under the law of the state in which the product is installed.
* 100 N. Broadway, 6th Floor, Wichita, KS 67202
50
Notes
51
This document subject to updates. For the most current Viega technical literature please visit www.viega.us.
Click Services -> Click Electronic Literature Downloads -> Select Product Line -> Select Desired Document
Viega LLC
100 N. Broadway, 6th Floor
Wichita, KS 67202
Phone: 1-800-976-9819
Fax: 1-316-425-7618
www.viega.us
©2015, Viega®, ProPress®, MegaPress®, SeaPress®, ProGeo® and FostaPEX®, are
registered trademarks of Viega GmbH & Co. KG. Smart Connect®, ManaBloc® and
Radiant Wizard® are registered trademarks of Viega LLC. ViegaPEX™, is a trademark
of Viega GmbH & Co. KG. MiniBloc™, ProRadiant™, Zero Lead™, PolyAlloy™,
SmartLoop™, are trademarks of Viega LLC. RIDGID® is a registered trademark of
RIDGID, Inc. LoopCAD® is a registered trademark of Avenir Software Inc.

Viega PEX Commercial

Transcription

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